The craziest old stump puller RD that I'm aware of is Suntour's AG Tech (alpine gearing). It's only rated to 38. Maybe you could make it work without a stupid wide range in the front mounted on a long claw hanger?

I run one on an old Ross MTB with a with a uniglide rear that goes up to (I think) 32 or 34, and it's clunky but okay. I seldom ride that bike because it's in my family's garage and I now live in the same city. It was my get-around while visiting for years and I liked it.