You can buy euro cylinders that allow a key to be in both sides at once.l and still lock / unlock.
I would say a Nuki would be my go to, no change to the external look of the lock. Can interface with a key on the inside of a thumb turn and if you want to change to a euro cylinder with a thumbturn inside so that it doesn't have a key installed inside permanently then that's 5 minute DIY job.
You can buy euro cylinders that allow a key to be in both sides at once.l and still lock / unlock.
I would say a Nuki would be my go to, no change to the external look of the lock. Can interface with a key on the inside of a thumb turn and if you want to change to a euro cylinder with a thumbturn inside so that it doesn't have a key installed inside permanently then that's 5 minute DIY job.