editing of MPE is still pretty new, even in DAWs - I think it’ll be a while (if ever) before we see it in hardware.
(ok, the linnstrument, kind of has one, but its not really what we are talking about here)
also, its going to be a small market in eurorack, given polyphony is expensive in modular… again, that’s perhaps slowly changing (e.g. last years doepfer modules)
of course, you can ‘fudge’ it with quite a few things now, but its hardly going to be a nice experience editing MPE data with any sequencer, that doesn’t have the concept of ‘note expression’ … it gets very disjointed quickly.
I think for now your best bet is to create a small midi recorder with playback, thats not particular hard to write - you could then export the midi, to edit in an MPE capable daw (like bitwig, cubase)
This is where programmable eurorack modules come into their own… I wanted the microSSP, but for now Im using a Bela Salt for this, and it works pretty well 
btw: you should check out our new independent discourse forum (polyexpression) , which is for all expressive instruments, we only launched last week - but starting to get a good crowd of musicians who are into this area - and this is the kind of thing we are discussing.
EDIT:
btw, Id say the topic title is a bit misleading… MPE is pretty niche.
I say to imply that the best sequencer would need MPE support is a bit of a ‘stretch’… and thats coming from a hardcore MPE fan 