I went back to judo, and I lived.
The thing I needed to do to avoid re-injury was to not curl my torso, and it wasn't too hard to do that because I didn't do any randori, and we didn't do any newaza tonight.
There were a few times that I may have stressed the rib slightly while working on sode tsurikomi goshi, but there were definitely no painful tweaks.
It's good to go and try out your ideas for real because for weeks, I imagined some kosoto gari and sode combo, probably because those are my current faves, but I tried it today, and the basic physics do not work. You are in front of your opponent after you attempt sode, and you need to be behind them, at least a little, to do kosoto.
As expected, I'm really out of shape, so I had to take a break during the drills, which I normally don't do, but I think it was the smart move. Well, time once again to reclimb that bit of the conditioning hill that I've climbed and slid down several times.