I think the remastering works a lot better on this one, without the drums getting in the way. Recording live drums is still a pain, and it gets worse the fewer mics you have to work with, so I don't blame them at all.
The steps you mentioned cleaned this up a lot, without harming the sound quality much. There's a tiny amount of hiss in that back that gives it just the right amount of vintage charm. If you want to do more mastering like this, I'd look into finding an exciter plugin that can add stereo width. Obviously it won't be like starting from a full stereo mix, but even with mono, just that tiny bit of width can add a lot on headphones.