Lefty approach shots are a great thing to work on to play for the opposite fade/if a tree is blocking your throw and are not nearly as hard as learning to throw 300-400 feet with your off hand. I think that's a useful time investment. Maybe eventually that can lead to driving off hand if you get that far.
I completely agree. I've been learning a LHFH approach shot lately. Nothing with too much power, but if I'm stuck behind something that I can only reach around to the left, a LHFH shot is much more comfortable and accurate than a backwards RHBH shot. My muscle memory isn't quite there yet, as I sometimes throw it 40' past the hole (i'm always shot on approach shots with my right hand). But the accuracy is there, and the distance is getting better.
I've tried learning LHBH, and it's just funny. I suppose I will keep screwing around with it, but I will probably never learn it unless I break my right arm. Then i'll have to learn it.