A plumber has just repaired a leak in my shower tap pipes. To do this he had to smash out tiles from the shower wall, and now I am left with a big hole to repair:

I could re-tile this hole but if I need to access the pipes again then its such a pain to go through this process again. So I was wondering if there are any watertight panel-type products which can cover the pipes and taps but can be easily removed for access?
I have seen access panels in drywalls on the other side of a shower wall, but my shower is up against the edge of the house (indoors) so I guess that is not an option. I thought about custom making a metal or plastic panel with quarter-turn latches to hold it tightly against the wall but I'm worried that it might not seal properly.