I was thinking of doing that with 7s. I like how 7s wreck the decimal, octal and hexi bases alike.
Witness anything in 7ths. 1/7, 2/7, 3/7… try making nice clean decimals? Nope. It won’t. Wrecks Base 10. Love it!
Also, I’m weak on 7s. I’m OCD by nature but I found by “going opposite”, it keeps it at bay. Example: I keep my areas messy to combat the need to be super-organized. it works.