I have a UHMW (Teflon plastic, .625 thick) skidplate on my VX. It makes a belly pan that starts behind the license plate and ends at the crossmember just in front of the transmission pan. I could've made it longer, I just didn't have the material.
It's white, it tolerates engine heat, and it didn't crack on a stump at 52 below zero. It's very 'slick' as well, so it should slide over rocks easily. I bolted it in to prevent snowpack in the engine compartment during my cross-country excursions this winter.
Something like this would be great to augment your skidplates. Slick, replaceable, and it would provide a cushion from sharp edges.