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When I fished out of Kona we set trolling lines within a mile of the harbor so if you don't need to run far and the bracket isn't an option why not just put a couple 20 HP motors on it?

I understand your mind is made up on twins but consider this: If you have twins and lose one, the other engine won't be enough HP to get up on plane. In that situation running the one motor at full throttle you'll be burning a lot of fuel and not running much faster than what could be achieved with much smaller trolling motor equipped with the right prop. The other advantage of that setup is you'd be more efficient at trolling speed.