Desmond: Indeed, Logic 10.5 with its Quicksampler does look very nice!
I had a brief look at it when attaching and booting into an external USB hard drive with MacOS 10.14 and Logic 10.5 on my 13" Macbook Pro (mid-2012).
What's doable right now is to upgrade that laptop from 10.13 to 10.14 (I'm not sure if it can run 10.15 or if that's desirable anyway) in order to gain access to Quicksampler in Logic, but with its specs (2.5 GHz i5 processor/16 GB RAM/1TB SSD) it might not be the best solution. And practical-wise my Mac Pro (mid-2010) is my everyday computer which is probably more powerful (upgraded to a 3.46 GHz 6-core Xeon processor/24 GB RAM, multiple SSDs and large 7200 RPM hard drives) and more practical as it's attached to my rack audio/MIDI interface (Focusrite 18i20), speakers, keyboards, 24" display etc.).
If I were to take the plunge and upgrade the Mac Pro to 10.14 I'd have to buy a new graphic card which at the moment costs quite a bit as far as I can see.
Ah... decisions, decisions...... then again people have made great music with Logic 10.5 (and earlier) including with EXS24 I'm sure, and even though it's not the flashiest solution out there today it might still be useable if I properly learn how to use it.
Madtheory: Success!

. I finally got Windows to work on my Mac! Not via Bootcamp (which turns out to be a real pain to install although I have succeeded in the past), but via Oracle's
Virtualbox (free) and a trial version of Windows 7 (ISO disk image file) downloaded from Microsoft. That and some good online guides made it possible for me to run EMXP as you suggested earlier and (unlike a Bootcamp installation) allowed me to easily transfer files between the Mac and Windows environments. Definitely not as responsive as with a Bootcamp installation, but good enough for casual use and the "shared folder" file-transfer is much more important for this sort of thing.
So with EXMP I've been able to convert Emulator I/II and Emax disk images to Soundfont (.SF2) files as well as WAV files. The Soundfont files open directly within EXS24 in Logic and once they're selected they get converted to an EXS file, so there's no need to go through a separate conversion process. Very nice!
I haven't yet tried any Akai S-1000 disk image files with it, but am sure it'll be just as effective.
For Fairlight sounds I really wasn't getting anywhere until I came across the
CMI series III and IIx library by Tomas Mulcahy which had sounds already converted to the EXS24 format (and some other soft-sampler formats as well). So finally I can use Fairlight sounds straight away although I was disappointed to see that the most famous/legendary sounds such as SARARR and ORCH5 weren't there.
(
I just noticed that you posted about this library in the first place in the KVR forums and the reason why those sounds weren't made into patches!).
Fortunately that library also came with WAV files, so I once I figure out how to actually use EXR24 (so far I've only used it to select already made patches in addition to adding new patches and auditing those) I believe I can make my own patches with those sounds. I really just need to set up a patch with a simple envelope (i.e. a little release) for a sounds like SARARR. Maybe it's possible to do this once, then copy/paste the same setup for different sounds, effectively and quickly making up new patches?
Following this I remembered the
Fairlight sound database library which I looked up again. Upon closer inspection I noticed that there's actually a conversion option (SFZ file-format) there! I was hoping for a further conversion option elsewhere from SFZ to the EXS24 format (or an intermediate format such as .SF2 which EXS24 could use) but to no avail.
So I remembered having already downloaded the free Plogue Sforzando plugin (SFZ player). This worked! But as far as I can see it's just a very crude sample-file player with no envelope or anything like that, so maybe the solution to this is just to dive in and make my own EXS24 patches for SARARR, ORCH5 (unless someone else has beat me to it and made EXS24 patches of those available online).
OK, I'm done
What's left to convert now are those Akai S-612/700/X-7000 Quickdisk image files (.QD). They're in the Flashfloppy and HXC formats, but from my understanding that's got nothing to do with the
audio part, just the
disk format, right? If I'm not mistaken they'll just work with the original hardware samplers once transferred to their floppy-drive replaced floppy emulator hardware. I haven't found any of the usual audio file converters supporting them (luckily now I can also look into Windows software), so is this just considered a "closed format" meaning they'll only work with said hardware samplers and case closed, or are there ways of converting those to WAV or whatever like with EXMP? As far as I remember from my X-7000 days it didn't have much of parameters to adjust, so I assume it shouldn't take too much time to turn them into EXS24 patches (transferring the original loop-point would be helpful though).