re theft--you know, if my bike was stolen with my B17 that is so comfortable now, I would actually be more upset about the seat. House insurance would cover the bike, but it certainly couldnt cover the time spent getting the Brooks nice and comfy and I'd have to do it all over again.
also, given the relatively short time with them before you go, I would recommend being open minded or rather very observant about the saddle position (fore/aft/angle) during your time before the trip as well as during the trip. I guess all seat position changes can make a real diff in comfort no matter what the brand, but my feel is that Brooks ones might be more sensitive to small changes. In any case, if you are at least familiar with trying some slight changes before you go, you can quickly do some during the trip if you feel the need (it is tricky with these leather saddles, as they definitely will change slightly as they break in and your sit bones begin making the little indents.)
hope they work out for you two this season.