Amen.You could do all that with the MPC, P08, LP and M3,
Sell the elektron stuff, it's not up that alley. sell whatever else you mentioned too, but keep what homeboy listed.
Honestly, if the m3 is a workstation that might be enough.
What i would do, is get out one piece at a time. try making some tracks using only the m3. oh you want to sequence it now? try integrating the mpc. now, when the m3 synth sounds leave you wanting more, integrate the moog and the prophet.
The point is, go back to the music, which you can very easily on the m3. I mean, you can write a piano only riff on the keyboard, yea?
integrate the other things only as you need them.
I keep crappy samples of bass and synths in my mpc for composing, then output that midi to real synths for recording.