Well the Brooks B17 was waiting on the porch for me when I got home last night. So I put it on, made some adjustments to the saddle height (it is quite a bit bigger/heavier than what I had on my commuter) and rode to work with it today. I probably still need a tweak here or there, but I don't see that this will be a problem, especially after it gets broken in. I still have 5 days of commuting with it before the tour.
If anything, I am wondering if I shouldn't have gotten a more narrow saddle. But, I think it is going to work just fine -- certainly better than the stock saddle that came on the LHT.