Some people go the FOWLR
route, then after a year, transition into corals while removing non reef-compatible specimen. One good benefit of that is that it allows your tank system to develop a good amount of bacterial colony. And they are the one keeping things stable to the point where you won't even need your Ammonia and Nitrite testers....forever, if not.
With that said, some people start their Nanos and Picos out without a long wait. So it's possible for reef to be conceived in less than six months if you know what you are doing. Especially in your case, you've been a fresh water hobbyist for a long time now, to the point where you fully understand water parameters already.
I say, yes, you can have a go at it since you know what's up.