My situation as well, though I usually don't have too much trouble finding size 12 regular width. I decided long ago I didn't want to be changing footwear every time I stop to take a hike (it's one of the reasons I have an Aerostich suit as well--if I know I'm going to be hiking during the day, I can just wear shorts under the suit).Sidi boots look great and are quality products it's too bad that they don't make them in wide sizes, my wide foot make it very hard to find boots I like that fit.
I also ride and hike a lot, and spend the whole day in the saddle often and am not ashamed to admit that I normally don't wear motorcycle specific boots, they are uncomfortable, too difficult to get on and off, to limiting and next to impossible to find a suitable pair in my size.
I have a pair of Asolo hiking boots that I wear and accept the risks.
My boot of choice for the last fifteen years has been the Danner Fort Lewis. Good for all-day walking, waterproof, and protective enough that the California Highway Patrol's used them since the beginning of time (or so says Danner). They can be re-soled and rebuilt, which is a good thing because I wear them a lot when I'm not riding; they're that comfortable and versatile.