Throwing in my 2 cents.
I believe the barrier meters to be more useful/informative than the limit meter. Honestly, I think it would have been neater to have the limit bar elimenated altogether, BUT, we don't want to change the gameplay experience too much, right?
Anyway, the limit gauge is largely pretty static. I have no issue with it being cut in half. Shortening name space/barrier meters will have the somewhat unfriendly effect of single width menus overlapping current HP. In other words, every character's selection menu will obscure the HP data. I thought it was a flaw that double width command lists obscured HPs, but now every turn, regardless of materia setups will overlap.
If you can manipulate the command list to justify absolute left, that may not be so much of an issue. Otherwise, it may be a much bigger modification, but how about stacking Limit/Wait gauges like the Barriers?
Maybe something to look into, since nothing would look out of proportion. Shortened limit gauge being the best bet (from my perspective) but it DOES look more peculiar.
Good luck. Nice to see this moving along!