Since no specific responses to your question so far, I have seen a post in a past thread, from someone that has had some success with a trolling motor, so you may be able to find it with a search. A raft probably has a bit more drag than a Bass boat, but seems like a single boat might be doable with enough battery. I've also heard people having a lack of success, so can't really say.
The other options to avoid the 2 stroke, would be a 4 stroke( required if motoring G.C.)
or a propane model. Both would at least be quieter, and not pollute as bad. There is a fair amount of Beta on Propane outboards in past threads.
We can't always agree, but we can still be civil to each other.