Here's a series of RE3 mods which replaces all enemies with one specific enemy type. So all enemies replaced with nemesis, all enemies replaced with zombie dogs, and etc.
All 8 variants can be downloaded as one bundle of mods directly from Fluffy Manager 5000: https://www.patreon.com/posts/36745578 (it's called "Enemy Swaps" in the list of downloadable mods)
Here are video showcases of 3 of the mods:
https://www.youtube.com/watch?v=df6meBz146Q
https://www.youtube.com/watch?v=aQ8aGZbk_Hw
https://www.youtube.com/watch?v=LswwMhvxt8g