You have to differentiate between the ticket, the paymaster, and perhaps, the paymaster's actual sponsor.
In the Traveller context, very few governments can afford Falkenberg's Legion, which arguably is later on a very well equipped, funded and connected reinforced independent light infantry brigade combat team.
They take high risk missions, but have access to enough intelligence assets to understand the local political and military situation.
My feeling is that in order to raise an equivalent force in the Marches, the paymaster would have to contract out to a Condottiere, who'd collect a disparate group of available mercenary units and try to establish a unified command structure.
Unless there are planetary defence forces that are willing to hire out their troops, and the hiring government would probably have an established command structure to incorporate them in their forces.
The cheap option would be to open up a hiring booth on a recent nearby combat zone, and hire anyone who can follow orders and know which end of a gun they have to point.