That’s what I’m planning to try in my own testing 
I haven’t yet looked into other systems like that, so not sure if they exist / how the results have been if they do. Interested if others have some experience with it
At this point I’ve played around a bit with simulating the distortion to determine how best to adjust for it, but there’s a few months yet before it’s particularly relevant for that investigating to be completed. It’s also interesting to consider that the refraction is slightly different depending on how salty the water is, so depending on how significant the effects of that are it might need to be calibrated for each dive to get the lowest decimals of accuracy. One positive if salinity refraction is actually significant enough to be detectable is that it would allow visually estimating salinity levels, which would be a super neat application.