I don’t think you need to go down the metalworking route - I’m thinking that some gumption and some Kydex (or similar product) would do the trick and would look professional enough if you get it right. Though I’ve never done this myself so I don’t know how hard it is to mold.
I asked this question earlier before the rule first came out - though my methods were a compression sock and some legos. I never did find out if it was faster, but I did run it at IMAZ last year and no one blinked