If the teams are designed for regionally aligned teams then plan for a 12 person team that has expertise in 2 of the 7 main survival skills, and are competent in the other 5. The 7 main survival skills are food, water, shelter, energy, security, health/sanitation, and communications. For instance one team member can be an expert at food and water, another shelter and energy, etc... The teams can have multiple overlap of expertise based on their region and scenario.
In other words, develop a task organization and chain of leadership, then tell the team member what expertise you want, based on experience. It's not about what a person brings, it's about what gaps exists on a team, and the member being humble enough to adapt to the need, and train for it.
In the mechanized infantry world we use the McDonald land drive thru
concept. We set up a logistics point where everything is on trailers or big trucks. Every mid morning and evening we pull up to the log guys in their trucks that are staged.
Truck 1-we pull up and get our Bradley's fueled off, smile, and wave
Truck 2 we pull up and get fed meals already cooked
Truck 3 we receive ammo and things that go boom
Truck 4 we get medical and health/welfare items
We never left the Bradley, and just pulled through to the next station.
The trick is to set up a command center with the trucks/trailers, then send out the a
12 person team from that.
In sum task organize for region, for most likely events, have a main team that interacts with people, and a support staff to assist using the McDonald land concept.