SteezeOG
Dynamic Discs #1 Fanboi
I don't think what you're asking for really even exists. If the disc turns, it will turn most when it flies the fastest, which means the beginning part of the flight.
If a flick is not an option, then your best bet is to throw a really US disc with a lot of hyzer so that it just takes long enough time for it to get flat and eventually turn over. Not the easiest shot to control tho. :\
There are a few that can have late turn but I agree with most everything else. One disc that I've seen have very late turn even as it has already started to slow down is the westside sorcerer. This is from a lot of different throwers too. It's kind of weird but it was designed with that flight in mind. It holds pretty stable (straight) at the first 70% of flight then has turn before slightly fading back at the very end.
As for the OP I usually throw a witness with a lot of hyzer or maybe toss a hatchet and hope I get it right.