150 discs might be a decent solution. But responding to what was asked earlier about stability of 150 class discs, some are pretty stable, and some are completly different discs. The X surge is a lot less stable, it's a completly different disc. It has .5 stablity compared to the normal 1.7 esp and z surges. I like it, it's a lot better than most of the other 150 discs on the market. I probably get more D out of the 150 Surge than any other 150 discs. Discs like the Flick, TeeRex, Firebird and Talon are still pretty stable in the 150g class, and would probably act like their max weight counterparts when using your left hand. They just don't stay in the air as long as a normal weight disc. They drop a lot faster, so you have to get them high, kind like you would throw a fairway driver to get more D.
But while you have your broken hand, maybe you should asses what you wanna get out of having to use your left hand. Do you want to learn how to play a half ass round with your off hand? Or do you want to learn skills that will help you once your right hand heals? I'm guessing it's a little of both. Using your left hand will probably give you a leg up when you are trying to get out of the woods, and when you need a right turn off the tee or in the fairway. Maybe you could focus on the shots you might wanna pick up whenever your hand heals, and tell yourself scores be damned while I'm throwing with my left hand, just as long as your picking up something useful for the future.
Maybe you can get Scoot_er to type out all the situations he uses his Left hand Forehand shot. He throws forehand with his left and backhand with his right, which seems redundant, but it works for him often. The way he explained it to me is that it's natural for him since for a left sidearm shot you are faced the same way as a right backhand shot. It's almost the same motion, he's just throwing with the other hand forehand. same rotation, just a switch up in what hand the disc is in. I've tried it a few times and and seems useful in the woods and for spike hyzers and skip shots.
I feel for you man, but I'm sure once you get to the other side of this, you'll have so many more shots in your bag.