This all reconfirmed my previous experience: the dining room is going to be a problem.
In the parlor and library, it was effortless (relatively speaking) to restore the wood in each room. Ditto, so far, with the oak in the stairhall niche. Ditto ditto with the round bedroom mantel.
But the finish on the original faux wood finish of the dining room is a mystery. WHAT is is? It is not shellac. I even tried paint stripper on it but that proved no easier a solution than alcohol.
So, maybe I will just paint all the wood in the room white.