Is the a way to wire a single output ignition coil (IGN 1A) for wasted spark?

On the spark plug side. I've never seen a splitter or a junction strip for spark plug wires.

No, wont work. The spark will just seek the easiest path to ground, so only one plug will spark. You could however connect two IGN1A to the same ignition trigger signal to get wasted spark that way.

What Adam said, he's on point here.

Also, if you could get it to work, you'd be halving the ignition energy going to each plug, and would likely strike issues lighting off the charge.