...They just have to be electrically initiated.
Thermalite fusing was great for that since it shipped with nichrome wire prewrapped around it. You could literally bend a piece over, attach clips to either end, hit it with 12 volts and away you went. For cored motors (i.e. AP) you could wire wrap wire around it and insert it into the core.
I still have a roll of it that I use for making ignitors.
If you want to use cannon fuse, you can, although not with any kind of great success. It's not hot enough and burns too quickly to reliably light AP. For BP it should be fine.
To ignite it, crack a flashbulb out of a photocube. Doesn't have to be a Sylvania AG1-B, either. Any old disposable flash bulb will work. Tape the fuse to the flash bulb. Insert other end of fuse into motor. Fire flashbulb with electric ignition system.
WARNING: Most Estes controllers will set off a flash bulb during continuity check...
--Alex