Cool story bro. Creatures without payment would get angry, fight among themselves and rebel leaving your dungeon without you being able to control them. And yes, they can and will destroy doors no problem.
Also, both skeletons and ghosts required food and pay checks in DK1.
Creatures did not get angry nor destroyed doors when I did play it. Instead they would sit in front of the door all day. Or stand in front of the door all day in a huge bunch. I would throw chicks to them with the hand. When the enemies did come I did throw them to the enemies. When the enemies where dead I would throw them back into the room. And I do not remember skeletons requiring food. I do remember to I did like the look of having small cells with skeletons in them all around the dungeon because it did look pretty cool so maybe that's why I did not notice, but I did never fed them. Or I did keep it as decoration in the dungeon heart. Maybe they take so little money I did never pay attention.
On later missions I did it the other way around, though: I made a strong door in my dungeon's main entrance and threw the inhabitants in the other side of it. They would all bunch in front of the door trying to get to the treasure room. The enemies that did attack had to fight them all to get to the door. Every new monster that did get to my dungeon I did throw it in the bunch and that was it.
I did play the game quite a long time ago so maybe I am mixing something up with II, but the fact that I did never pay my troops I do remember because I do hate time limits and I did always feel the amount of gold in a map was a time being forced on me. There are many things I never did because of that: I did not know you could sacrifice things in the temple until I did read a let's play for example. Or at least I did forget it, because I did never use it on my playthrough.
Maybe I did hit a bug or something with the door thingy?
Edit: I do also remember I was unable to actually attack the enemy dungeon because they would not respond my commands or something (i could throw them somewhere but if there was not an enemy to attack them they would make a beeline back to the door) so I did destroy the enemy heart by possesing one of them, running to the heart, hitting it until I died, possesing another, running to the heart, hitting it until I died, etc, until the enemy heart died instead.
I was a little xploiting bitch when I was smallish.