The guy no longer makes those mounts, If you found one for sale, or talked randy shivak into making you one for $400 The problem would still exist. You cant mount it to the sheet metal top cover for the AK, It would probably bend and fall off after a few shots.
Your only chance would be to weld an AK/SVD scope mount to the side of the mount and attach the shotgun that way. Its attached directly to the side of the reciever but will the mount hold up to the pounding?
Too much $$$ involved if it dosent work, thats why I havent tried it + It'll be a heavy SOB.
Maybe Tony from tromix