There are many devs that what to make 90’s and 2000’s styled games and the Unreal Engine 1 would be a great step for the creation of older games.
I don’t think that is going to happen because of licensing agreements and other things. Also, Unreal Engine “1” was mostly custom solutions for various companies which wanted to do various things.
I suggest you use Unreal Engine 5 with awesome tools to create proper games with the look of the early 2000’s style. Here look at this: Elias Wick - Advanced Pixelation in Materials - UE Marketplace