I know, I know. The Odyssey just doesn't look like the right instrument for the reasons you've mentioned. The lack of memory and MIDI Out would result in major clumsiness for seamless performances of pieces. I found it to be true with the Voyager Old School as well. Great instruments, but they just don't work for me. I had intended to experiment with controlling an Odyssey module with my upper Prophet '08. I think that would be a decent use of it, so that remains a possibility. But since I just (happily) spent my 2017 synthesizer money on a second P'08 Module, I'm left with selling something to afford something else. Until I see an instrument that really strikes me, I'll continue with my present set up. I mean, think of the regret that could come from selling a Poly Evolver Keyboard in mint condition for something new but unsatisfactory! Probably only DSI is the likely company to produce something sufficient. If they come out with a poly synth with the right architecture, then I'm ready and willing to sell, but not until. I'm quite hoping in DSI and anticipating good future news, as always.
I'm still half-intending to create an ideal mono synth, something founded on a superb instrument like the Pro 2 or Minimoog, and supplemented by a module or two. It has to have a superb analog quality, but also offer some digital waveshapes. But this may have to instead come through my upper Prophet '08.