Doesn't seem that complicated to anodize at home

https://www.youtube.com/watch?v=GccTVfMiIIo

http://astro.neutral.org/anodise5.shtml

I'm sure you know all this already but I find it interesting ;)

If you need to keep the solution agitated a small maxijet water pump would probably be fine they are designed for semi acidic environments I have a load of spare working pumps you can have one for free if you want and if it melts who cares. But leave it a small test jar first over night I think lol be annoying to destroy your acid with melted plastic.