I like this because you can use any headphones with a built in mic and you don't look like a weirdo.
https://www.amazon.com/BTECH-Connector-Adapter-Compatible-Headsets/dp/B019YJMRZS
*facepalm* i'd be frustrated with that too. if it's the k1 type, what about using it with a different (compatible) mic? or if it isn't entirely the mic you're after as much as attaching headphones, apparently Btech makes an adapter to use standard headphones with an inline mic and 3.5mm plug (and gives you a remote PTT button (just stumbled on this).
https://www.amazon.com/BTECH-Connector-Adapter-Compatible-Headsets/dp/B019YJMRZS
Not exactly the same but it gets you the 3.5 mm and the ptt on a 2 pin.
BTECH 2 Pin (K1 Connector) to 3.5MM Adapter with Push-to-Talk Button (Compatible with 2 Pin BaoFeng, Kenwood, BTECH Radios to 3.5mm Headsets with in-line Mics) https://www.amazon.com/dp/B019YJMRZS/ref=cm_sw_r_cp_api_glc_fabc_1uE3FbZWFANH6
The Baofeng isnt type certified/capable of airband use or type certified for FRS/MURS frequencies. You first need to decide what freqencies and modes you are looking to use. If you are not a ham, you are limited to FRS, MURS and the airbands ( Part 87 Subpart B of Title 47 )
I would suggest something like what ICOM has to offer with bluetooth in the airbands, the IC-A25C or, snag a GMRS license for $70 and program your baofeng for those frequencies and get a speakermic with an earpiece port.
EDIT: If you are looking to use your Baofeng, I think i found a 3.5mm ptt adapter that will work. Snag a GMRS license and get this thing from Amazon.
I went with the very affordable Baofeng option that was brought up in a thread a couple weeks ago. You can manually program it or program it from a computer using free software (/u/theman00 has been posting .csv files for all drivers/broadcast channels that you can upload directly, all at once). This radio IS a transceiver, but you can disable the transmission capabilities. 127 programmable channels that you can assign the driver or broadcaster names to. I used mine at the Indy 500 and it was great.
CHIRP is freeware that works really well for programming this and many other radios.
Amazon links below:
Note: Programming it with the USB can be finicky because Windows will continually try to update the driver to a newer version that isn't compatible with the chip. Its an easy fix, but you'll have to go into the device manager and roll back the driver to the older one. Instructions Here
Edit: added link to CHIRP software