I don't have a WFT-E2 II, but if the ad-hoc problem is the same as the one I'm having with my E4 - don't waste your time. I don't see it working until either Apple or Canon fixes the issue.
Sorry, ShutterSnitch is not available for Android. Maybe there's a similar app, but I must admit I haven't looked.
Since the ad-hoc issue is not necessarily a software problem (it's either the chipset, driver, or a WFT thing) you may want to test it before buying.
A workaround for the WFT + iPad 2 scenario could be a portable wireless router (or an AirPort Express, if you'll be shooting close to an outlet).
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