I did just that for my field 1187. Very flat shooting field barrel. First trap modification I made was to install an adjustable comb trap stock.
The comb is raised a modest amount, enought to turn it from 50/50 to 60/40. This dies cause the top of the rib to be seen, but that's really no big deal if the gun fits you and shoots where you are looking.
You're not supposed to be looking directly at the rib top nor bead anyway, but focus on the clay and use peripheral vision for the barrel/bead.
The ONLY reason to worry about seeing the top of the rib is glare. If you rib glares, paint it with matte black paint, or have it bead blasted and reblued, or install a custom add-on rib that's tapered so that you see no rib top.
Or in my case, I eventually bought a trap barrel that has a slightly higher stepped rib.