I'll start out by building my wheel and getting the new crankset.
If it works, Fantastic I've got a much newer drivetrain that I understand better than what I've got.

If the Suntour Mk-II can't handle it I'll put the current parts back on the bike, and wait until I can get a new set of derailleurs front and rear.

That way I can always return the bike to it's vintage state by re-installing the original parts.