There's no harm in playing around and experimenting with ideas, however over engineering something to give you the same result as something that's a Proven method just seams pointless and rather complex to problem solve when it goes wrong.
I'ld rather you enjoy the model then come back in a few weeks asking for help when it starts to go wrong
There is no set ' right answer here' a lot or Real life boats use water pumps to cool them, others use prop driven water flows, but were talking on a model where truth be told simple tends to be better, think long term, maintenance, repairs etc etc, the more complex a boat becomes the more time, and money end up being spent to keep that one boat running.
When you have a fleet of 40+ reaching past 50 like I do. that's a lot of boats to keep repaired if i innovated on all or even half of them i'ld never be able to afford or have the time to keep them all running,
Simple works and simple means easier to repair/ fix, problem solve and overall cheaper, as well as not spending days or weeks fixing something when you could be onto something else.
I've done that when i was a Lot younger and spent a year fixing 1 boat over something as simple as changing a prop shaft which i stubbornly refused to do ( ball raced shaft seized up and i swore blind it was the motor and the shafts were just' stiff') until my old man basically told me dead i was wrong and to listen to his experience, something I've never forgotten since. Fyi he was right, changed the shaft boat ran fine a week later.
You may not always like the answers to questions dosnt mean they are wrong.
just my 2 cents here, sounds a bit Bla now i read it back..

i really really really just don't wanna say ''i told you so''