Actually, it doesn't sound like GMRS is the right radio service for you. But there's some good news.
You mentioned "squads" and you also mentioned "snow plowing"
I don't know if this is for rescue or some municipal services but if so, you should try getting a license for and a frequency/pair in the government pool where your operations will be better coordinated from interference such as 5 year olds playing on their FRS radios. If you are eligible for a license there, you will be exempt from the filing fees.
If not, you should try to apply for a part 90 business pool- perhaps itinerant frequencies (itins. don't require coordination but must be shared with possibly many others).
If you went the GMRS route, everyone that uses the radios that isn't related to you would also have to get their license and there is the common belief amonst many GMRS users that business communications such as snow plowing isn't allowed and they will sometimes go to ridiculous lengths to advise you of such
whether they are correct or not or whether they are breaking the law themselves. As it is, a part 90 license is cheaper over the course of a 10 year period than a GMRS license over that same time.
MURS is out because that's for VHF and you don't have VHF radios not to mention the radios you have aren't compliant with the MURS restrictions.
As others mentioned, to just program them up to a seeming unused frequency and transmit there without a license puts you at risk of criminal penalties.