An impossible task? Reverse current/short circuit protection not only for load but also for power supply
It appears you want to do something with the load side circuitry to protect the supply from overcurrent caused by shorts in your magnetic connector. As stated in the comments, you can't. It is not physically possible. Possible options that would allow you to continue using this connector include installing a PTC fuse or similar circuit in between the power supply and the offending connector, or ensure you're always using a supply that can handle shorts.