Will Cosmetic Surgery Alter My Hearing?

I would think so. The outer ear (the Pinna) not only gathers sound but it imprints directional information on all sounds picked up by the ear. So Brad's comment seems on the mark. Also, generally, as an object approaches the size of a particular wavelength it can effect it. 20kHz wavelenght is .0565 feet or 1 and 1/16 inch long. 15k is .0753'. Maybe this could have some effect too.

Your doing the opposite of cupping your ears to a lesser degree and you know what that does.

I remain,

...the bottom line is that drum receptors aren't being changed neither cosmetically nor physically. it might even drive you to the different equipment that is different from what you're using but for real the freequency bandwidth will not change.

Look at it as being some kind of ultimate tweak. If you don't like the new sound, change cables (in the sound system, obviously). Good luck and prompt recovery.

One of my relatives had his ears "pinned back" as a young man, and he lost some of his ability to judge the direction of sounds. He never regained it.

I can perceive a timbral difference when I push my ears forward a bit, or pull them back, or whatever. I'd suggest you do this:

While listening to music or even a constant noise source (I'm using the air conditioner to test my theory as I type), use your fingers to approximate your anticipated post-procedural ear geometry, and see how you like it.

Cheers!

Duke

PS - when I was a kid, they called me "wingnut".