My original question still applies, something you are going to do yourself, or pay the shop?
I forget who, or have the name wrong, John in Marrysville did the swap, the GW ring gear swapped into the Valk final drive. I've never done the rear, only seen it on TV/youtube. I've a GW rear drive as a spare for a just in case time.
What do you think a shop would charged, 4-8 hrs? A replacement drive is a fixed cost, $450 USD, and can be swapped out on a wheel change. Then you can fix the old one, when parts become available and help can be found. If I remember right, I paid $30 for the GW drive years ago, just the right one and price at the right time.
I think if you could find a good Valkyrie rear in good shape, this would be the way to go. As for doing the Goldwing swap. It shouldn’t take a shop near that long to do. Basically all they are doing is pressing one out, and then pressing it in another.