I use a Kawasaki dual output coil with my Boyer. The coil is from a Z550 and has the advantage that, unlike many japanese coils, it has removable HT leads so you can replace them without replacing the coil.
They're not too expensive either.
If you are running points and wire both trigger leads to the dual lead coil, wouldn't that make it a wasted spark system like the Boyer? Never tried it, but my common sense (or lack thereof) says it should work.