Gas gun suppressed brass only gets so clean for me. Bolt gun stuff shines up pretty good though. That's all cosmetic either way.
I like some of the ideas for a home made wet tumbler, but the cost for an electric motor would run me around $100 locally. I would be starting from scratch and would have to buy the other materials for the tumbler, stainless steel pins, etc.
A cost effective option would be to buy a kit with everything a person would need to get started. MidwayUSA has a kit for $140. https://www.midwayusa.com/product/1019428848?pid=396592