Oh, I get what you are saying. I was just thinking of something that wouldn't take major surgery to simulate. For instance, take those silicone (semi in-ear) tips, and use them on something like this. It has a dual DD driver, one 14.8mm and the other (a whopping) 16mm. Just saying... heheNot quite what I mean, what I meant is putting the usual MX500 15.4mm into an in-ear shell. I imagine a lot of front vents must be opened to cut the unholy amount of lower mid and bass that MX500 drivers tend to have when working in a sealed environment.
I have a set, and I am here to tell you that you can EQ the bass up really high (even though they aren't in-ear) on these. You could really be a TOTAL bass-head with these if you wished. Though they would need a complete re-tune because they are way too hot in the upper mids as it is. Take that away, and they do sound good though.
Either way, it is a really neat idea that they have come up with.