I'm left hand and I've been looking high and low for lefthanded locks. The only options I know of are:
Chambers left hand siler and gunmaker kit
L&R locks
R.E.Dav Hawken lock
The amount of shaping that can be done on a gunmaker kit is limited by the placement of the tumbler hole in relation to the frizzen. You can not make a banana shaped lock out of it
I made these two banana shaped bridelless pistol locks using the guts, hammer, pan and frizzen from a small siler lock and making a new lockplate.
To get the banana shape, the tumbler hole had to be lowerd in relation to the frizzen.
To lower the tumbler hole, use a compass to measure the distance from the middle of the tumbler hole to the frizzen screw. Place one compass leg on the frissen screw and draw an arc on the lock plate. The center of the new tumbler hole has to lay on this arc. Lowering the tumbler hole will require adjusting the, frizzen toe, cock shoulder, mainspring hook(that rests on the tumbler) and the tumbler beak(where the mainspring touches the tumbler).
I've test fired the locks with powder and they work fine. It's surprising how far it's possible to lower the tumbler hole without messing up the locks function.
It should be possible to this with parts from a large lefthand siler.
Best regards
Rolf