I know next to nothing about zombies and the craze of the last years (series, games) has somehow fully bypassed me π€·π»ββοΈ
Still, I could imagine the following could work:
Putting the watches into a solid, shock proof caseβ¦

A watch that can do Mount Everest, probably works with zombies π§ββοΈ

Maybe magnetism deters them. If not one can blend in and they might not notice you. If all else fails one could poke their eye out with a pen ποΈπ€·π»ββοΈ

Does cold make them stay away? π€·π»ββοΈ
Hopefully with these I might be safe π€π»