What if we manufacture a few Neotenic Stimulator for say a few dozen monsters first to help fight off the the invasion?
We then capture a few monsters here and there, maybe obtain an unhatched egg. Then put it on them as soon as they’re out, not before tranqing these beasts first of course.
Then once they think we’re their mommys we can ride them into battle to support hunter squads or platoons.
Then all the monsters will slowly be tamed into helping rebuild Shear and they will be given high protein diets of concentrated wildlife products by Nordita who will soon monopolize the monster feed market.