I don't really know how to write Lua scripts, so I just copied those codes from hereBulldozer Rush. And only do a little modify.
*Even without this mod you can still play with cloakers in MUTATOR mode. Compared to that, this mod dosen't disable your achievement, but have chance to crash your game.
This mod will replace all assault units with Cloaker.
When you play single without AI teammates, cloakers won't kick you down. They'll only shoot you with their SMG.
HOW TO USE:
Extract and place the folder at (whatever)\PAYDAY 2\mods. You need SuperBLT to make this work.
Note: I didn't and can't fix any bug of the original mod. So this mod may not work at some maps, such as MurkyWater contracts. And it may crash the game in some situations and conflict with other mods. Get ready for anything.
2020.10.04 Update: Make this work at Murky contracts.