Phil Wood hubs for future proof wheel set?

I'm looking to build two (650b+700c) "good" Clydesdale proof 126mm spaced wheelsets.

Shimano 7 speed 126mm cassette hubs, cassettes and parts are still around but not readily available.

Phil Wood 126mm freewheel hubs are available, and supported. Freewheels are available, and I've got...