So i build myself a nice place and walled it in and put some gates. I have a gate on every side so that's 4 gates 4 locks and 4 keys.

So my question is, can I bind one key to multiple locks and if so, I probably can't bind a new key to an existing lock on the gate... and will have to knock down my own gate...

What would be the best way to sort out my keys without stuffing a bunch of key rings in my backpack.
I got a second problem... I cut down a tree and it fell throo my wall. And now it's stuck there. I can't pick it up or chop it to pieces. So is breaking down the wall my only option? My Phlegm is 15 and I can't even get to 1% trying to destroy the stone wall. What is the best tool to knock down walls?