The good thing is brushes are cheap and easily obtainable, if not OEM parts available your local automotive alternator/starter rebuilder will have a set of brushes that fit or can trim down some slightly oversize ones to fit. Bring starter with you.
New starter (well cheap $70 of amazon) works a lot better, compression reads better than 150, but still turns over slowly.
I then moved jumpers from car to engine and starter directly and it was dramatically better.
It's enough for me to say it's worth a serious effort getting it running, which is the minimum I wanted to get done in the short term.
I think rebuilding the honda starter is the next step, then battery and new cables.
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