Should be able to fab up something and screw/bolt it on... But make sure it will work with doors on. Folding down the windshield would work... But too hard to do for a day out wheeling... Then have to put back together. Hmmmmm. I need to think about this one. I know ive been off on big leans and have been close to wacking the a pillar on small trees (and the ground) :-)

 

The rigid light bar may work dor you... Complete a pillar cover. There are a few other heavy duty light bars as well. Alternatively, have a local shop fab up some diamond plate.

 

I know it doesn't help but today my buddy bashed the hell out of his A pillar. His tires hadn't cleaned out all the way so when he began climbing a large boulder he slid right down the side and into a tree.