are you talking trolling artificals around 3 mph - or live-bait at 0.5-1.5? For live-bait trolling I would stick with a trolling motor - if you're doing artificial, then I've seen a few kicker motors out there....
If you're trolling artificial then just buy the troll control module and use your big motor. You'll have better speed control.
If I had a pontoon, it would have an ulterra on the stern and the trolling motor of your choice on the bow. With an ulterra out back, you can use it to self deploy and help keep you in line, sort of as a side thruster.
I see no need for a kicker with technology these days.