Two solutions...if you're not going to use your laptop, why not use the SIM card from the stick? If you purchase a SIM cutter you can cut the regular SIM down to micrSIM size. The SIM cutter comes with an adaptor that enables you to place the cut down SIM back into the stick.
Of course, if you're taking your laptop, then it's easy (if your laptop has WiFi) to make your laptop a WiFi hotspot and then connect the iPad that way.
Tim