Well for what it's worth, back when I was in my LMB fishing days. I thought about that whole thing also. So I bought a left hand baitcasting reel for an extra pole I had in believing that it would work. On paper it does, but when in actual use it does not.

Now that I think about it, perhaps when you use a spinning setup in your right hand & crank with your left hand because of the reel being "under" the pole vs. a baitcaster setup the reel is "above'" the pole? That kinda makes sense. But in any event it didn't work the way I thought it would, so I gave the left handed baitcaser setup to my wife who is left handed & she likes the setup.