I don’t see why it wouldn’t work as long as there is enough adjustment left in the cam for the extra thickness. Filling the groove with a hard epoxy first would give some backing for the thin wall tube to. Better yet, a quick TIG weld using stainless filler rod would be the ultimate fix.
The 7.5 motors with the brass follower seem to wear more than the 5.5’s stainless follower and I have brazed them up in the past before reshaping them. Replacing the original follower with a later style one with a roller might be an option to. Can’t say cause I’ve never tried it but the matching cam would be needed to. There were at least four different cams used on these motors over the years so matching the part numbers would be a must.
