If you fixed the problem with the cleanout threads, i'd clean around the tiny leak real good with a dremel tool or grinder and epoxy the leak, use a two part epoxy and mix it well, it should outlast the pipe. Clean an area about an inch around the leak to bare metal and you should be fine.
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Just out of curiosity, lets say one of these old timers needed to remove that clean out piece, would the molten lead be chiseled out or would it be heated back up with a torch?
I have no idea of the temperature at which lead becomes molten again.
I woulodnt bother trying to get the lead out of the fitting in that situation,id just cut the pipe above and below and use no-hub couplings to install new piece.
The pipes sit down inside the hubs,it would be tough to take apart without cutting,although I do know of a few ways to remove that fitting and retaining bottem hub its kind of risky if you dont do it every day.
"facts" have no relevance to this discusion
Posting from a concrete bunker under a non descript barn