This seems like a common conundrum, and one that I have experienced meself. After hemming/hawing for a year I recently bought a pair of the Voile Objective BC and immediately laid in some mounting inserts. This allows me to cater my boot/binding choice to the intended target, made easier since I own...

Just the tubes with U wire, really - I have the adjusting wires and heel throws. If anyone has a pair laying around, let me know. They don't need to be in great shape, just serviceable.