This is pretty cool I've actually had the same idea for a long time, even thinking about directly using saltybet. The only issue in my opinion is that you have to trust saltybet not to manipulate the odds and results of the fight somehow. Our team was never able to figure out how to make this provably fair but it is a pretty novel idea at least for betting smaller amounts for fun.

If you somehow figure out how to make this verifiably fair I will be super impressed.