bet I can… 
beer kegs hold vacuum. available of craigslist for ~$50.
you can tri-clamp directly to the oem sanke flange.
https://www.amazon.com/Horiznext-homebrew-stainless-weldless-bulkhead/dp/B07LDQPPRY will get you a vacuum port.
Comparing vacuum filters - #3 by cyclopath shows the rest of the setup. simply welding a 2" ferrule rather than the 6" I used would allow the mixer bowl ($60 used) to clamp directly to the keg. I just happen to have a perforated stainless disk that was cut from somewhere else than fit nicely in there, it should be obtainable for $50-60 cut to size (so it fits snugly in the bowl, without additional support). assuming your welder charges $100 for installing the 2" ferrule (mine certainly wouldn’t), you’re looking at less than $300.