There was a guy who ported a DX7 emulator to a bare metal raspberry pi. Why the port was on bare metal is beyond lions. Maybe the pi wasn't fast enough to do all the processing. The process does seem to involve porting a VST plugin from source. There's no windows emulator for the pi which can run a headless VST plugin.
The most likely outcome for a DX7, K3, & piano emulator is going to be a dedicated windows confuser.