Yes when I did it I decided on a permanent fix.
1) Built shower frame
2) Connected all pipework
3) Installed hardware (same as you) prior to tiling
4) Tested system for leaks. (Ran shower but caught the water in a bucket)
5) Tiled wall.
6) Drilled holes into tiles and slipped over shower valves and body jets.
5) Let adhesive set. Grouted tiles.
6) Silicone filled all the joints BEHIND the cover plates.
7) Pushed cover plates over valves.
If anything goes wrong with the unit after tiling then its fairly hard wired into the build so its a bit of a one time operation. (Dont get it wrong - no leaks!)

This is the coverplate pressed onto the tile. Behind it is a bead of silicone but the silicone is not "On Show". Because I didnt want to see a silicone run.

This is the bodyjet with the coverplate pulled back and the screws exposed. Again some silicone BEHIND the joints because didnt want to see any silicone.

Of course we do every single size drill for tiles so we do have them available to other people who might want to attempt shower valves.
PS: Sorry about the grotty looking chrome-ware on the shots. The shower is now 5+ years old and needs a bit of a descale!!
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