Here you go; got the conversion plate from Bert a couple days ago, finally found the time to do the conversion. Took all of 35 minutes. 100% reversible.
Only issue at the moment is that there's a focus calibration issue, and I may have to adjust the top ground glass to coincide with the rear focal plane.
It covers a pretty big chunk of a 4x5 Fuji Instant film. Need to check with 3x4 Instant as well as 4x5 film, coming soon