Easy, ebner etal:
Here is the definitive contingency. Have a stock(not futures) options account open with a firm other then IB. You need a non IB route as well as a non globex route, and in fact even a non CME route. Keep in mind Friday was not IB's problem but Globex(although IB will have outages as will anyone). Since you don't have a ton of margin money available, QQQ or SPY opts will give you the most hedge for your buck. Lets say your'e short 1 NQ=800QQQ and an outage occurs, you can buy calls(whether in the money or out depends on how much $ you have and time to expiration). You may still wind up short a couple a hundred deltas if you can't afford to buy an adequate amount of primo but at least you'll be pretty much protected. Generally $1500 is more then enough to buy enough calls to be OK.