I have vintage style bath-mounted tap with a hand shower attachment. I want to mount an elbow joint on the wall connected to the shower head hose (which is pointing vertical above the taps) to make a proper shower without having to pull all the tiles off and refinish.

I cant for the life of me find such a elbow connector. I can find wall mount elbows that have the connector in the wall and I can find 15mm to compression joint elbows.

Am I thinking about this the wrong way or am I just looking for the wrong parts? I have seen shower kits that contain the said elbow joint but they are too expensive, I have a tiny budget unfortunately. It must be possible to as its pretty simple in theory. Help!