Pico8 has four greens in its palettes 3 (darker) 139 11 138(lighter).
There's no surface data, just a bunch of 3D segments, so no way to do hidden line removal, but you could separate them in four lots based on on the Z of the middle point of the segment, and display each lot from back(darker) to front (lighter) for a similar effect.
If you still have CPU left after that, maybe have a 4 color gradient in the map, and use tline instead of line ?