Upgrade/Replace Nord Stage 4 Compact Keybed?

I am awaiting delivery of a Nord Stage 4 Compact. As its 73-key keybed is the same as or similar to that of the Nord Stage 3 Compact or Nord Electro 6D, would it be possible to replace it with a superior keybed from another manufacturer, and there any suggestions for a keyboard wizard who would attempt such a feat? The NS4C has a three-sensor, semi-weighted keybed with aftertouch. A pure organ/synth touch would be desirable.