If you want to try one out it is a really easy modification to your current setup.
Buy a strip of balsa wood at the local hobby store. Cut to length (mid rib or shorter). Take a black marker to it and then tape it to the barrel. You may want to cut a notch for your existing bead. And a bead can be fashioned out of a small push pin or a piece of tubing from an aerosol can.
Do not criticize this modification until you have tried it. The shorty rib works really well. And you will not see the ramp at all, your eyes don't look at it.
"My concern is that there is no center bead like most trap guns, so it is hard to judge what your p.o.i. is going to be."
I know this may sound critical but beads have nothing to do with POI.
As an example I shoot a Beretta Combo at one time I had 3 barrels for the gun. A top single a bottom single or mono gun and a OU barrel. I you laid them on a table with the end of the barrels against the wall. The center beads were all a different distance from the end of the barrel. Yet the POI was the same on all three.????????????
I shot one with a glove stock last fall. Two things I learned, the glove stock is everything its cracked up to be. It does force you to mount identically each time. Seriously wish I had one for my gun. The high/short rib is interesting. The few targets I shot with it I kept looking along the side of the rib while tracking the target and overshot most of the time. You have to force yourself to look down the rib and focus on the target. A big plus was it keeps your head up and I felt I had much better vision picking up the target. I'll bet it would take you a year of shooting to get used to it. Hal Hitchcock
This concept makes sense if you hold any kind of high gun at all. It allows you to look below or through the barrel with less distoration. My personal opinion would be Perazzi might be able to shorten the rib even more and still accomplish the same goal.