1. You can buy used shin guards (and probably hand/pole guards) cheap on eBay--there are always retiring racers getting rid of old stuff.
2. Borrow a baseball catcher's shin guards. It's the off season for baseball. One of the masters racers at a ski camp I attended had catcher's shin guards, and we all thought it was tres cool, rather than hick.
3. No offense, but how good are you? Worse than 40 handicap (time 140% or more of zero handicap racer) beer league racers rarely need shin guards because they don't typically shin gates, and not having hand protection will probably save you from the standard non-elite slalom racer mistake of reaching across the center line of your body for an outside hand gate clear. That having been said, you can really bang up your hands if you do a lot of slalom training without hand guards, even with padded racing gloves and duct tape.
4. Byron Friedman and a couple of other guys on the US ski team this year glued plastic guards onto the back of their gloves even for GS events. So if people give you a hard time about that, you can tell them that the technology is cutting edge, straight from the U.S. ski team.