So I finally got my seized rear wheel off.
Unfortunately the right brake shoe adjusting cam is seized and the nut badly rounded (presumably due to a previous effort to unseize it).

Has anyone else had this happen to them? If so, what did you to free it? Is there a way to remove / replace it? I’ve tried penetrating oil and freeze/release spray with no luck.
ideally I’d replace the cam and nut. I see the cam available in spares catalogs but not the bolt. Is there somewhere I could get one made up?
thanks,
Mark