Stick grip
Karee,
I see that you are interested in an RV-4 from your personal info. Having owned a tailwheel RV-3, RV-4 and now an RV-8 I absolutely endorse having the starter on the stick. Trying to hot start a tail dragger on a windy day and doing the throttle/mixture dance with only two hands, taking my hand off the stick is not an option. I once saw a taildragger using a key switch on the right side try a hot start on a windy day. The engine roared to life (not sure of his hot start technique) and I guess he couldn’t get his right hand to the stick fast enough. You guessed it, nosed right over on the prop. He eventually got the engine overhauled and a new prop. If he would have had the stick full aft the whole time during start it would have been a non event. Maybe having the starter on the left would have helped.
Easy to incorporate a consent switch of some type that has to turned on to enable the starter button on the stick grip.
I also have the flap switch on the grip but don’t particularly like that option, would rather have it somewhere near my left hand. Haven’t had any issues because the flap switch is up high on the grip but all these options are user preference.
I’ve used old military grips, the Infinity grip in the plane now and a Tosten Military grip that was engraved by Midwest panel sitting in my hangar with a new stick ready to go. I haven’t put it in yet but I really like it being fully assembled when I got it. Installation on the stick is also simple unlike the Infinity. You can easily clock it to your preference and if you don’t like it you can rotate it and clock it again to a different position with a simple Allen wrench. You can’t do that with the Infinity- it’s one and done or you have to take the whole thing apart and cut a new slot in the stick to remount it. Yes it can be done but a real pain in the butt.
Lots of different techniques and products to choose from, use whatever works for you.