On your tumbling, I only tumble with crushed walnut shells that i buy from Petsmart or Petco. It is so fine that it can't clog the flash hole. I do ad a small amount of Nu Finish car wax as it helps shine the brass. This might help you shorten one step.
Like you, I use One Shot case lube and I tumble in the same mix as above for 5 minutes and it seems to remove all the lube.
I'm no where near the caliber of most on here but I do take pride in my equipment being clean, functioning properly every time. I would love to shoot 3 Gun but my disability limits that for me. Hopefully there will be something setup for people with limited walking or mobility issues to compete with our guns. I know that Bench Rest might be a challenge, but it is not the type of competition i think I would enjoy.