It may be worth getting in touch with the member in West Australia who machines various adapters for members at reasonable prices (AMAZING quality workmanship).
Sorry, my memory is CRAP but it may be Joshua Bunn perhaps.
https://www.iceinspace.com.au/forum/...&highlight=RC8
I'm sure another member can point you in the right direction but a search on Google showed nothing for 60mm to 2" I could find.
https://www.iceinspace.com.au/forum/...&highlight=RC8
I have a Vixen imaging extension and I know it's a b@stard size, from memory around 60mm but I had to get a friend to machine up an adapter so I could use it for anything.
I found an email address for Joshua:
Scastrophotography@outlook.com