Dear Original Poster ... justify the need for the conversion ?

I have used a Phil Wood Freewheel hub On my Loaded Touring bike for a long time.

One advantage to freehubs , be it Malliard Helicomatic or shimano or suntour,

is the axles, won't, so easily, bend.

on freehubs its relocation of bearing cone to the extreme right end.

Phil solves that by just making the axle so it won't bend. it's way larger than 10mm ..

Haven't heard back from RR on what they understood 10 speed to Mean.

as that has changed since the 70's