How would you do it?
One solution would be to stand up V-22 squadrons or squadron temporarily then transition them to VRC-30/40 when the VRC's sundown the C-2, VRM-31 and -41 transition to 30/40. They could even 'share' the squadron for the transition period with different detachments, that has been done before. Or create the RAG and have operational dets spin off from that, eventually becoming the squadrons.
Having the RAG carry on the heritage of VRC-50 as Fester already suggested would be pretty cool. I am pretty sure there was a relatively recent change, within the last ~5-10 years, that allows squadrons in the Navy to be come 're-established' and officially assume a squadron's history, before when a squadron was disestablished it was gone forever. I think @nittany03 might have the details on that.
I think it would be a nice nod to history to keep the squadrons' heritage and history, one of those intangibles of military service that gives folks a little more pride in what they are a part of and what they do .