Unfortunately a paint job thick enough to avoid rapid wearing, even if you use solvent-diluited paint mixture, will change the texture. Furthermore a paint job will generate unremovable paint collection along grooves. You have good chances to irreversibly ruin your mac at a closer look. But if you had a cheap LC, i guess it might be worth a try.
If you really want restore rougher textures you could use 180 sandpaper and an hot iron imprinting its texture on warm plastic even if I find it useless cause i'm sure noone if temporaneously blinded will easily distinguish the original and the reworked texture because the latter is still rough.