Morning Gregg,
When I had my SL I was able to tie the kicker and the main together with the Seastar Teleflex tie bar.
http://www.seastarsolutions.com/products/hydraulic-new/outboard-new/seastar_kicker/I don't think there was enough room on the smaller Arima's to use it.
It worked great in conjunction with the autopilot. When trolling with the kicker you could just leave the main down in the water not running. It would help the kicker steer as it acted like a rudder. With this system you had a pilot for the main and kicker both. Highly recommend it if you install a pilot.
By the way the Furuno Navpilot 300 looks to be a good unit. One nice thing is it comes with a remote which I'll probably end up using more than the head unit. The Sabiki mode looks like it'll be good when backing into the sea when fishing for halibut. The pilot will keep the boat heading correctly with this mode.