Would be a bit nervous about hanging heavy buckets , knocking it etc if it's just hanging off the end of the copper.
This doesnt look too bad. Would a 22mm compression nut fit 3/4" BSP male?
Why doesn't anything like this exist:
...but which accepts a 22mm inlet pipe and has a 3/4 thread for a large garden tap? All I can find in this size is wallplate elbows, but I want a straight-through-wall type.
With or without the copper pipe pre-soldered doesn't matter.