Yeah Crawler neck and RY bridge sounds like a bit of a funny combo to me. I would tend to go for a calibrated set, either Crawler or RY, as I doubt that they play well together. In general the calibrated sets are very well matched, in other cases what you are really relying on is guesswork. Generally if the bridge from a set works in certain guitar then the neck will too. With mix-and-match sets this might happen, but it might not. There are some other neck pickups that have worked well with the Rebel Yell bridge - maybe the VHII neck? or the Emerald? - but the Crawler seems like something very different.
You could always try one set and if you hated it send it back for the other one. That said, if you live a long way from the UK like me doing that within the specified period is a bit unrealistic. Often you need quite a while to make up your mind, especially if you are inexperienced at adjusting heights etc like I was when I got my first (unmatched) set. It took me a couple of months to decide that I would have been better off with a Cold Sweat set, rather than a Cold Sweat neck and Nailbomb bridge.