Pontoon boat owner here... hopefully my last season before I upgrade (similar situation, have two little girlies).
I have a 24V 55lb MG Brute on a gator mount on the front of mine. I fish out of my pontoon boat like I do out of a bass boat, foot on the pedal covering water all day long. Yeah, she's a bit hard to handle in the wind, but even with a small trolling motor, I can keep it under control (as long as the batteries are charged).
Get one - you'll dig it. For a boat your size, you'll need to go as big as you can. Make sure and measure for proper shaft length.