Perko flush pro makes it easy to run the motor anytime and winterize.
I do find I have to seal the hull intake with tape to get it to suck AF from a bucket.
I call the "MCODumb" of using a bucket because of a fear the volume of water the pump can move Dumb. Any flow of water will lubricate the pump to prevent wear and garden hose can flow plenty of water to prevent overheating from my experience. I run it up to speed, tune etc, watch the temp go up then go down as the thermostat opens.
Bucket is fine for AF delivery but Dumb for general running if due to fear of lack of water.