Ok, so I've done a lot of testing and playing and I think I have a doable strategy for 100/20. It requires tons of luck and skill.

Turn on everyone but System Error Toy Bonnie, Burnt Foxy, Chica, one plush animatronic, or one Plush Baby. This will be your 100 roster. (Really you can turn off any one you want, but these are the ones I feel may be the best to take off)

Put the wet floor sign on the right side. Then place the audio lure on the left side. Go to the prize counter and continously click the camera to farm for coins. Close the camera every ~15 seconds to see if anyone is there (remember to watch for Withered Bon-Bon/Bonnet). Get 10 coins, buy the deathcoin, and remove Marionette. Watch Funtime Foxy if needed and continue farming coins. For Malhare, buy a tape at 1 am, 3 am, and 4 am and he will be taken care of. Remember to check Funtime Foxy every hour to see if Plushtrap appears. Watch Burnt Foxy if needed. Once you have 20 or more coins, continue to gather coins when possible and wait for a plush animatronic to appear. Get rid of it and keep on ridding them as they spawn. The minimal coins needed will be 85 (which is a lot, but it's the only way to make it semi-possible).

After 30 seconds, start closing the left door and top vent when in your camera. Close your right door before opening your camera in case of Dreadbear and turn on the global music box for a few seconds before opening your camera to take care of Chica. When a Plush Baby laughs, you have 10 seconds to scare it away.

You might have to risk Rockstar Foxy and Shamrock Freddy for coins, so click them if you have to.

You have 40 seconds to deathcoin Marionette before the music box runs out.

Funtime Foxy times: 1 am (0:45), 2 am (1:30), 3 am (2:15), 4 am (3:00), 5 am (3:45), 6 am (4:30).

I might've missed some stuff, but this is the basics that you'll need to know. I think that with enough time, it could actually be done. Good luck to everyone that tries this.