Well I say yes get a kicker as others have said its a back up.Imagine being stranded and the wind kicks up and it begins to get nasty out there at least you can point the boat in the right direction.Yes a VHF radio is another must and yes you can call for help.Being out on the water is not HWY 401 where there is an abundance of tow truck drivers competing for your business.
As for a trolling plate NEVER AGAIN. The happy troller model broke a piece of the fin when I had it mounted on a previous motor of mine 50hp Honda that lesson cost me $300.
Another point why put hundreds of hours on the main motor when you can use a kicker and consume less fuel.If your main motor is a 2 stroke so trolling with that.NOT