Idea for a class:
Engineer-Every knockout , grants him money , he can trade money to upgrade himself , upgrades could include , gadget rarity increase , speed boost and damage boost.
Assuming the enemies are sentry’s , sentrys don’t have knockback even if the health type is set to fragility.Also sentrys don’t move so it might be a bit difficult to replicate the enemies moving , like they do in apocalypse.
Props are do not respawn but you could make an illusion of this by using this guide