There is an old saying from the Great Depression, "You could put all I know about [insert subject here] on the head of a pin and you would still have room for the Lord's Prayer. For most of the audience, during the Great Depression there were fellows with a common pin which had engraved upon it the Lord's Prayer. It would be in a pin cushion and have a magnifying glass propped over it. For a penny you could look through the glass at the print.
OK, so what this means is I really do not know much about [insert subject here], in this case the leather on your camera. I am thinking a solvent to dissolve the glue but not harm the leather is in order here. But, head of pin. Cobblers, handbag repair shops, jewelers could possibly know. Oleg in Poland who works on Contax could possibly do this. I cannot speak for you but if it were my camera I would take it to a proven professional. It's a very rare camera. It demands a very rare level of care. Good luck. Keep us posted!