Walkie talkie mic and headphone 3.5 mm sockets

Iam wondering if I could get two walkie talkies (2 way radios but I prefer calling it walkie talkie) and add two 3.5mm jacks one for ear phones and one for a mic.  Using a splitter 3.5mm for the sockets, a 3.5mm mic and a 1m extension  for the mic so I can put the walkie talkie in a pocket. Can someone tell me if this will work please and any suggestions for improvements to my plan 

You should be able to add the jacks to allow the use of external mic and speaker.

In a walkie that has that capability built in, the jacks are usually of the type containing an internal switch that disconnects the internal mic or speaker when a plug is inserted.

The enclosure of your handheld is probably not going to be large enough to accomodate a couple jacks, so you will most likely have to bring the connectors outside of the enclosure with wires.