Question for an ATH-M50 modular headset mod

I have a pair of ATH-m50s (not the highest end cans, I know, which is actually why they are the target of this mod) Which I plan on modding for the purpose of switching out the cable.

I also happen to have a boom mic from a broken Creative Fatal1ty headseat, and was hoping to turn my ATH-m50s into a dual-purpose pair of cans.

For the interconnect from the headphones to a regular amp/source device I was thinking of using Canare star-quad cable with either neutrik or pailiccs terminations. (3.5mm)

For using it with a mic I'm not sure which cable to use, or which plugs/jacks.

For example, the iphone has a 3.5mm plug on the bottom that works fine with regular headphones, but when you plug the headset that comes with the phone (it has 4 contacts vs 3 on the 3.5mm jack) it works for both outgoing and incoming audio

Where can I find a surface mount version of this? Also, where can I find a 3.5mm plug with 4 contacts?

From there I was going to have it Y-split to a Microphone 3.5mm jack and a headphone 3.5mm jack to use as a standard PC headset. This way I can just disconnect the mic and the cable when I leave my PC and connect up to a hopefully shorter cable for regular listening/listening on the go.

Sorry if I am unclear on what exactly I want to do, I'm not really sure how to word it so it makes sense.

My original intention was to have a detachable mic.

I was thinking about that, the mic I have has a TRS 2.5mm plug on it, so it is presumably stereo. In the case of using stereo audio and a stereo mic I would probably have to use two separate cables one for the mic, and one for the headphones themselves, right?
Unless they make a TRRRS but now we're just getting ridiculous. 

Maybe if I use a different type of connector on the headphone side, and retain the TRS connector on the other end, since Canare Quad-Star cable has a shield and 4 conductors its presumably possible to use it for the application, sharing the ground line between the mic and headphones.

So basically, now I need to ask a better set of questions:

1.) Will sound quality be affected if I share the ground line between the headphone and microphone functions of the headset?

2.) If I use the shield of the Star-Quad cable for the ground, am I potentially defeating the purpose of the shielding?

3.) My mic has a TRS connector on it, so it is indeed stereo,  correct?
4.) What low profile connector can I use on the headphone side that accepts 5 (or 4 with a shield contact) seperate conductors?

5.) If either 1 or 2 will affect sound quality, are there any cables that have 6 total conductors?

Quick edit:
What about something like an RJ25 connector? I'd like to stay away from those, since they are usually pretty brittle, but I may be able to find a metal one. I think thats about as low profile as you can get right?