2012 200 ZR409 Coolant Flush

I just upgraded from a 1977 Ski Tique to a 300 hour 2012 Nautique 200 team with the ZR409 and have a quick question about flushing coolant out of the closed cooling system. Based on what I am reading in the manual in the "DRAINING FRESH-WATER PORTION OF THE COOLING SYSTEM" section if i want to change the coolant I need to drain the fresh water side of the heat exchanger, remove the large hose from the circulating pump, drain each side of the block and manifolds. I have a heater. I would like to remove as much of the old coolant and replace with new coolant. Could I not just flush the system entirely by removing the heater inlet hose and placing it in a bucket of fresh coolant and then place a hose where i disconnected the heater inlet hose and place it in an empty bucket.....Start the engine, the circulating pump would pick up out of the bucket filled with new coolant and discharge old coolant into the empty bucket. This path would allow me to get 99% of the coolant replaced an prevent me from having to drain coolant into my bilge. Should i just do what the manual says?? The boat came from the south and will be through its first winter in CT this year. Thoughts? Im using 50/50 DEX-COOL. Thanks in advance.

Got it, I was hoping to super flush the system, looks like ill do what the book says :). Thanks

Chris,
Sure, you could even add some of this, run the engine, drain and refill.