Problem: Lost Key for Carrera Crosscity E Battery. Idea: Modify Lock to Accept Different Key?

I wanted to be able to remove the battery pack from my Carrera Crosscity E folding bike but I don't have the key. After picking the lock and removing it from the bike, I could either buy a new one (only about £20), or I thought I could maybe modify the existing lock to accept an existing bike lock key, which would be a lot more convenient! For a video on how to open the battery case and remove the lock see Ebike repairs:    • Carrera Crosscity E Battery Lock Replacement