I agree with Kevinshorses and MacabreMikolaj. If it's not broke why fix it. If your horse is as well trained as you are saying AND you have soft hands, that bit isn't causing your horse any pain. In fact it'll give you a heck of a lot more stopping power than a french link. So if you just need something "just in case" he spooks and the rest of the time you are using your legs/seat to direct him I'd keep him as is.