After a few days of study and repeated attempts to unscrew the valve with pressure, or remove it by heating it, I decided on a solution. I was able to free up the valve handle itself so that it works using heat and penetrating oil, so that problem was solved. I worked some emery paper between the valve base and the boiler and polished up the valve. Then I soldered the valve to the boiler. Perhaps not the most elegant solution, but the boiler is so nice, with a beautiful patina, I couldn't see disturbing it. So the valve works and should not leak. I think I've turned the corner with this sweet engine.
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