Easy fix - just become better at the thing that is most fundamental to badminton, and that everyone is trying to improve already! a.k.a. footwork.
By pushing to develop his game solely with the backhand serve, you are asking OP to run before he can walk.
You say many amateurs can't high serve accurately - if they served half as many times as they did backhand serves in doubles, you can guarantee the quality of high serves would be better.
Anyway, it's either:
1) backhand serve and get good at covering 4 corners quickly
2) high serve and get good at defending
Given the fact that most players get smashed at very often in doubles compared to having to cover 4 corners, the defence improvement is probably easier. That and playing a block to net also requires a lot less learning (and difficulty) than learning how to quickly cover 4 corners under the high pressure that amateurs often attack short serves with.
As always, it's best to be able to do both, but if you're looking at improving soon, the high serve will be a lot easier to pick up, and you'll then become fast enough to handle backhand serving.