I would like to use my Asus WL-700 router with a Huawei USB HSDPA modem (a E220 )

I'm currently running the kfurge custom firmware 1.0.7.8.
I know there are some tutotials that apply to other Asus routers, but I would like to use the WL-700, preferably with this firmware (but I'm willing to investigate others if necessary).

Does anybody have any experience with using UMTS USB modems on this router? Can it be done easily?