So, here's the current update.
I did end up adding 8 oz. of sugar. But then, there was no activity and the gravity didn't drop. I think the yeast ate up the added sugar, but that didn't help get it going enough to take it any further than it had gone before. So, I decided to pitch a different yeast to help it out. I had a packet of BRY-97 that had been sitting around a while, and decided to throw it in.
My thought was that I already got all the flavor from the 1882 Thames Valley II, so the fresh yeast could help get a little more attenuation without doing much to change the flavor. The BRY-97 was slow to get going, as it normally is, but then my SWMBO commented on smelling some fermentation activity (yeah, she's putting up with having a fermenter in the bedroom, because it's better than having it in the living room). So, I thought I was golden and the next day I was going to take a gravity reading...
...and I broke my hydrometer.
Luckily, it didn't break in a beer or anything that tragic. It was just in my bucket of sanitizer. That hydrometer was the one from my initial homebrew starter equipment kit, so it lasted a good 4 years before giving up the ghost. But anyway, I ordered a new hydrometer and took that as a chance to order some other stuff as well (

), because if I'm going to pay for shipping, then I may as well make it worth it. And if I'm going to order some extra stuff, I may as well order enough to get free shipping from love2brew.com, so now I'm getting ingredients for a batch of a Biere de Mars (from Northern Brewer's recipe, but cheaper with the free shipping from L2B), a new bottling bucket so my old one can be just for sours, and I'm restocking the fridge with yeast for bottling aged beers and some standard back ups.
Anyway, my order should get here on Wednesday, so I'll have a more substantive update later this week.
I'm still waffling on a decision about the apples/cinnamon/nutmeg. Maybe a taste when I take the gravity reading will help clear that up.