Tough for a jig
As you have probably already discovered, one of the problems with sheet goods is the fact that they are largely unsupported when coming into the front of the blade. Unless you build a dedicated in-feed table (the best solution), about all you can do is use a good quality roller stand in front of the table to help hold the floppy sheet up (and also one at the rear if you don't have an out-feed table), use a pair of roller hold-downs on the fence. When you begin feeding the sheet make first contact against the fence with the far right forward corner of the sheet, and as you begin feeding it, push the the rest of the right edge against the fence as the sheet goes into the blade. It can still be a scary operation, and requires your utmost attention. The biggest help probably comes from having an out-feed table and a supporting roller stand at the front.