So I just went and checked, because I suddenly thought that maybe I’d imagined the sample synth component…but no, it’s there! Add component → Synth Sample Player. You can do a SetSoundWave from asset .WAVs, and maybe you’d want to do this dynamically to cut down on sample player instances (though I imagine they’re much lighter on the CPU than the modular/granular synths).
What it doesn’t have is stuff like NoteOn/NoteOff, but you could build that logic yourself by checking isLoaded, current position, finished, etc. I guess you’d have to double/triple up on per-MIDI-channel instances if you wanted tails rather than cutouts when new notes are triggered, or polyphony, but that stuff also starts to go beyond the limits of the 8/16bit aesthetic 
Good luck - keen to hear how you get on!