Got my hands on a piece of HY/EPCM hard, it is 22mm high, but its only a small piece, maybe enough for 3-4 rails.
So I really need to see how I can do this...
Maybe I need to find one that is 5cm high.. hard to get, seriously - anybody here who has a source???
Anyhow, I will let you know, maybe I glue 2 pieces together with JD Weld. the one from the edge and the one on top.
However, you get one for sure, send me your address by email (I will take 1-2 weeks to make those grabrails, I am also working on alloy compound ones with a somewhat nicer cover instead of grip tape