Hi! Would pre-rendered Blender props fit your art pipeline? I can make small, worn environmental objects for the ruins and interiors — signs, grave markers or simple storage props.
Here's a low-poly prop I made, with a textured model and source files:
https://donghao-works.itch.io/retro-fuel-pump
For a US$5 paid test, I can make one simple static prop from an agreed reference, with a transparent PNG view, Blender source, GLB and one small revision. I'd like to start with paid work and build from there if the style fits.
If this workflow suits the game, please share one reference and the camera angle / target image size you use.