Not had any luck in finding somewhere that can source a new yoke and flange although I am still waiting to hear back from some companies including some mentioned above so fingers crossed.
Had a few that will build me a prop but only if I supply the components, I can cut the flange from my 260Z prop no problems (because I've had no luck finding a GTS-T flange for my diff) but the yoke on the RB25 prop is really rusty and I'm not sure it could be used.