Scorpius, here's an idea.

How about if during registration step, users are presented with choice to either
1. Proceed with normal registration (though this would not work anyway for now, but keep it for later versions)
2. Let users input any IMEI number and treat them as registered users. That way they don't need to install NITdroid and can finished their registration on other phones

I don't really know the detail on registration process, but I think shouldn't this work? Since yappari only needs an already registered phone IMEI for generating password right?