His op seems to be calling for a full length rail covering the top of the receiver and length of the hand guard (that’s how it reads to me, anyway).
But if I’m wrong, a regular riser rail is the best solution. he wants to use normal height rings but also wants to keep the same over all height for the entire length of the rail. Maybe so it will work nicely with his clip on (I’m assuming this part, nothing in his post directly addresses NODs).