In-Flight Throttle Failure-What To Do?

Reviving this thread! Here’s my hypothetical situation. You have a broken throttle cable scenario where you have full power, smooth enough not to overly concern you, but now you need to reduce power to descend or slow down or whatever reason but you really don’t want to shut off the engine and then need to restart it knowing it’s going to instantly jump to full power when it restarts.

Could you simply switch off one ignition module to reduce power, fly for a while as needed, then switch back on to both ignition modules if you needed full power again, without causing other internal engine problems as a result? I guess this is the long way around of asking does operating a 912 on just one ignition module for a few minutes in flight cause any internal issues to the engine (fuel flooding, wet spark plugs, etc) that would prevent you from quickly returning to full power again? Along the same lines, what if you engaged the carb start circuits, just a bit, to reduce power in order to descend or slow down, what would be the ramifications, if any, of doing so during a emergency situation?