Long term I would redrill the foot brace holes and move them up. I think foam and duct tape will last maybe an hour. You put a lot of pressure on foot braces.
If you want to try a very temporary fix with foam, buy 'mincell' foam. It's available at kayak shops or NRSweb.com.
If your legs are that short, you should look at improving the thigh/knee boat connection as well. Get some contact cement and several sheets of 1/4" foam and some 'dragon skin' to carve some thigh braces. Find a friend who has done some customizing of their cockpit. A good body boat connection greatly improves control and rolling ability.
Rescue / Throw Bags
Free Standing Boat Racks
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