If there was a locking right angle, you'd be on to something ! The concern is the lockin mech, it can really make more work when switching machines.

I got one of the locking AL Bro ones and really liked it, as great as it was, became a pain when switching machines, and I also found most machines didn't need to lock. Now I wear long cuff gloves and got into the habit of wrapping the cord around my wrist to reduce the pulling out of the cable.

Mono jacks work well, but no one wants to switch again, that an bagging becomes a pain. A RCA with a sort of push button lock or release would be ideal but the costs on something like that would probally be more restrictive. I have an idea but honestly can't see it coming to fruition.