I think Mick (MCP) already has a conversion program.

While not tested propery or completed, I can get most dt SongWrite into abc here.

Yet Another Digital Tradtion can get it into abc and PMW.

I don't think that's a problem.

The problems the way I see it are defining whether there is a need for a player/browser app and which platform. Agreeing on a tune format to use, perhaps a live Mudcat version etc.

Apart from finding a developer if needed for poss one app, the main barrier IMO is the "Mudcat/DT loop".