Supercool thread! Sorry you had to post it under such unfortunate circumstances; hopefully things will be changing for the better for you...
I clean/whiten a lot of skulls as well, mostly hunting trophies; mammals, done a couple of larger birds also. Never even occurred to me to try fish! Although they look and sound like a lot more work. I use mostly the maceration technique, but live out in the sticks so the stinky containers are way out behind the barn, nowhere near the house.
I don't even know if the beetles are available up here in Canuckistan, but they also probably require a fair bit of maintenance and feeding. How do you keep the colony going if you are between projects with no food for them?
Most of my fishing is catch and release, but when I think of some of the big fish I have seen/found dead, or been unable to revive/release successfully, or had the opportunity to salvage from other fishermen...dang!