+1 Canon fuse is an awful idea for clusted bp motors. do not use it, you will never get all motors started anywhere near the same time.
All cluster flying should always be done with a Relay ignition system at the Launcher, with as high an amp/hr rated battery as you can afford.
Igniters can be home made if dipped with a bp or pyordex/NC lacquer tip. Personally I use an Al/Ap mixture on my custom 30ga nichrome igniters to get a slightly slower burn rate that allows all motors in 2-12 motor clusters get started before first motion of the rocket.
If interested in REALLY reliable BP motor ignition regardless of igniter chosen, visit
www.narhams.org from the left hand drop down menu look for the Library section and Tech Tip folder, download Tech Tip-006 - Clustering BP motors. This in depth tech tip will give the reader a complete look at what has to happen in the first fraction of a second of the launch button being pushed to have multi-motor cluster ignition success.