Copper out the wall is still naff to plaster around/look at if you're then going to a tap of some kind.   How about wall plate elbows?   https://wavin.com/en-sg/product/f0bb1231-b2fc-4949-8c8d-bd4a6615a933   Run hep to that. Screw in a plastic dummy.  Plaster. Unscrew plastic dummy. Screw in either an ISO valve then the tap hose or a hose with a 1/2" male end; through a rosette to hide the plaster edges.     As above is how they do this by defau
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