I once inquired about this to a French guy making spoked wheels for all airhead bikes.
His answer was that the front hub is very specific of the R65 and no other hub will fit. HE said I had a choice : Either pay a premium to have a set of spoked wheels that fits, or install a front fork from an R80 or R100. And lve with the discrepancy and strange handling it will make (short wheel base with the R80 or R100 angle...)
I declined both and stayed with the snowflake wheels.