and explanation of the "extra channels". Its a bit of a marketing ploy.
Channel 1-14 are FRS and are standardized from one vendor to another these days. Channel 15-22, may be different for different radio manufacturers and are GMRS frequencies which need a license.
Stick to Ch. 1-14 only. Program in different quiet codes (PL or CTCSS are other names and more accurate)
You could also program in the MURS
channels on VHF into that radio, as long as you correctly set the power and deviation levels I suppose.
If you wanted to be extra fancy, you can program the Wouxon radio to transmit on FRS channel 1 and receive on FRS channel 7 and call that channel 38X and then program another channel called 38Y and make it so it receive on FRS channel 1 and transmit on FRS channel 7. One radio would need to be on 38Y to talk to someone on 38X and vice versa. This set up would only work for one pair of radios. Anyone else would need to toggle back and forth to talk to who they want.
Anyone with a standard bubble pack FRS radio would have a hard time hearing both sides of a discussion that way. Hope this makes sense and don't see any legal reason why this is a bad idea. Or go one further, do MURS and FRS as a mash up. Add some PL tones if you feel are needed.