( I know you’re having fun. )
If someone actually wants an alternative to the SV-2 sort of thing happening in a keyboard, one with 48 keys, as opposed to 37, and a real sequencer, you have 112 HP in the NiftyKEYZ, room for two SV-1b modules. for four note synthesis, and still have Eurorack space left over.
I found used SV-1b units on-line for $500 USD. So for close to the same cost of the new SV-2 keyboard, you could buy the NiftyKEYZ and the two SV-1bs, plus.
If you are ready to wait, getting the SV-1 Minis ( i assume they are Eurorack ) and you will have even more room. No word yet on price for the Minis.
Remember too that Cre8audio and Pittsburgh Modular are corporately related.
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Still want a poly-aftertouch NiftyKEYZ !