F-18 legacy Hornet question

I am building the Kinetic F-18 legacy Hornet. I am working on the intakes. attaching the splitter plate to the intake faces left an unsightly gap that. I filled it in and sanded it, but I was a bit clumsy and remove the detail on the splitter plate. I am talking about the detail in these pics

I am trying to figure out the best way to add it back. I am considering a rivet tool but I am finding getting the spacing down tough