Can’t shift a 26 fork I’ve bought in error, so was thinking about keeping it for a rainy day.

Then I read the x fusion slant can be 650b if you use a 10mm spacer to stop bottoming out, so if I ever did get a specific 650b frame I’d be fine for a fork.

I know clearance would be minimal with bigger width tyres. However, if I ran wide rims (wide lightening or light bicycles 35mm say), could I get away with a 2.2/2.3?