Independents would be allowed but should fall into one of the prescribed rolls. Example would be that an independent police could attach himself to either the BAF/BPA or KNF/KSP depending on which side of the border they're on. No problem with AoR running escort. Keep in mind the escorts can be of two types, ones protecting the convoy in general and ones more focussed on the protection of the weed boats depends who is paying the fees.
The $1 mil will be supplied to the convoy from the cash pot. The cash will acts as a bonus for whoever's able to obtain it. The rest of the pot then gets divided evenly so that all parties involved get something at the end.