From just looking at my 4 cylinder 2 coil engine it maybe possible to have some logic that divides by 2 and switches output devices via a switch on dash to fire correct spark plug.

Thus by adding a Carby we have something useful if computer dies or in the outback.

 

From just looking at my 4 cylinder 2 coil engine it maybe possible to have some logic that divides by 2 and switches output devices via a switch on dash to fire correct spark plug.

Thus by adding a Carby we have something useful if computer dies or in the outback.

How will that work? You do understand that the spark needs to be at the correct time, don't you? The sparks aren't random but timed to the correct point in the stroke cycle.

 

For a concern like that the best choice is a carefully packed spare spark controller AND a spare ignition coil. Pack up the spares well enough so that they will not rattle around and be damaged, or get we and corrode. AND get a decent legal two-way radio so that if you do have a failure you can radio for help.