If the paratroopers cannot be parachuted, then they should be converted into an ambush unit: rework to four people and maybe five people, give camouflage, give the ability to sabotage: destroy a point - the point does not give resources until the engineer will not fix it, or a trap on a point - a unit that will return it back will be blown up, or another ability for active sabotage. Rework weapons upgrade to an ambush style.
You're aware that partisans already exist?
Plus, falls were deployed for years the same way AGs are now.
Its just nomenclature.