Since the MPC is going to have you extensively covered for sampling I feel like the Rample might take up HP that could be better used for something else. Do the CV and gate outs on the MPC handle envelopes or LFOs? If not, something like a Klavis Quadigy, Intellijel Quadrax or Cosmotronic Delta-V might be a good replacement to provide modulation for the Doepfer voice. A modulatable effect like Mimeophon or Morphagene or Qu-bit Prism should give you something that will get good and weird in the way that Euro effects do so well. Noise Engineering Versio modules also offer the benefit of swappable firmwares (and sound amazing). I don’t know how well the MPC can handle Eurorack level audio, so something to receive and send at line levels like Boredbrain Xchangr might also really help to integrate. You’ll want to process sounds from the MPC in the rack, but also bring them back to mix and mangle.
Edit: Just saw the Doepfer amplifier so can disregard that last suggestion :)