A couple late night rambles to go with what's been said.
Like others I'd toss in some $$ to defray costs to get things setup and running ($100 etc.to a go fund me)
As for monthly/annual fee, I'd go with as long as it was on the lower end ($25/50 annually). But in all honesty, if add revenue can support it I think it will help to get more people in the door and coming back. Or maybe free but some perk to paid members.
I think getting everything we've got here ported over would take more resources than we'll have available (my honest opinion). But the idea of an archive section where the valuable data could be retained would be awesome. Even old topic threads. As long as they're searchable the information is still there even if you can't add to it or comment.
Use whatever software is easy to setup and gives us the base things we need. Major customization will continue to plague going forward.
While the R* itself is no longer a current model I don't think opening it up to all Yammi models is the answer either. I already belong to one of those, they tell everyone to come here for expert advice. A niche isn't bad if done well.
I'm an IT guy by trade but unfortunately this area isn't my forte. But if someone taking the lead needs added help I'd gladly help with a little guidance.
I bounce across a couple other bike forums but RSC is the place I always have a tab open during the day. So you could say I spend way too much time here listing to what you all have to say.
I'd also vote that while this is all being spun up, if we could find a way to help Gram ($$ or whatever) to keep the roadstarclinic.com domain pointing to an active site until a cut over is ready that would help as well. As another member said, don't want people leaving and searching for an alternate home.