Bob:
Sounds like you are getting outfitted ...
8) FYI: you can get quick release tethers for "unhooking' straps from helmet and extra attachment pins / washers for multiple helmets (sharing a device). As long as users have similar seat inclinations (safe with P-cars) and neck sizes that fall into the same range (15.5" to 18" is one HANS device size).
Jase