Better off just swapping old cannons out for the new all in one cannon (v3) and hooking them all up to an external flasher. The new cannons play well with external flashers and they have no inline driver to worry about.
Seems how you necro posted, can you confirm this works? I have a new pair of cannons that have the inline box, that won't flash off a carbide, and Feniex is telling me no cannon works with an external flasher.