I just got back in from a ride up to the airport, once around, and back home (14.6 miles). On the flats, as long as I didn't put too much pressure on my leg, and kept everything nice and smooth, I just got the occasional twinge. The hills were a little iffy, harder to keep the pressure off, but not too bad if I kept the gear low and relied more on my right leg. (Of course, the biggest hill on the BWI Trail is only about 5%, and it isn't very long.)
So I'm still in, if you guys don't mind me being EVEN SLOWER than usual

(my average for the ride today was a whopping 11 mph -- though the 30 mph winds may have had something to do with that

). You guys can do hill repeats as I granny my way to the tops.
I'm going to re-look at the route and pick a join-up spot; I may forego the Ellicott Mills Brewing Company to eliminate some of the Ellicott City hills. (One beer stop is probably more than enough for me anyway!) I'll post again when I figure it out.