IMO, it will look like an unfinished hack job without the molded lip of the bumper surrounding the exhaust tip.
If you decide to give it a try please keep us posted on the modification and post pictures of the finished results. I'm sure others would be interested as well.Ya, I see the small recesses you are speaking of on the top side of the port now that you point it out. I guess it all depends on the angle of the chrome ports in relation to the bumper slant. I am certain some sort of trim could be fashioned to keep it from looking like "a hack job".......where there's a will there's a way. The chrome ports are 350 bucks on eBay and I believe they are OEM