"So far i have seen only one m95 in 7x53r for sale and one 9,3x53r with older (m88?) Steyr action.
Unfortunately i have no photos to share. "

did you mean this unique rifle?

imho, this was one of the rumanian Mannlicher 93 that was captured by austro-hungarian troops in WW 1 and then changed by Steyr from 6,5x53R to 8x50R. if you compare the cartridges and complete different en bloc clips you still believe that only the steyr factory alone was capable to do this work. this rifle found the way after the war to finnland where it was converted to 9,3x53R again years later.
your idea with the M 88 was not bad because the M 93 was a modified Mannlicher M 92 ( the later M 95 Dutch rifle)and this M 92 was developt direct from the M 88. probably because Steyr had the machinery from making M 88 and was looking for something that can be made on this after the production ends.