While I really appreciate the idea of this, if I recall correctly, ZUN seems to react negatively to mentions about the PC-98 games towards him.
This does not mean this is not worth asking, especially if he does not need to be in charge of it, but I have my doubts.
Regardless, if this does get the okay, this could throw us into a new chapter of Touhou gameplay interest, and it would be interesting to see where that leads.