Hope Springs Eternal... Blasting, Degreasing, Rust Removal are a fair amount of effort and if you could get away with simply shooting some rattle can on 'em, and it it would stick, look better and stop the Rust, I wouldn't blast, etc...

But unfortunately, lasting results that don't flake off and which stops or slows rust, involves cleaning as best you can to Bare metal prior to coating or painting, though it would be nice if you could get away without all that effort.