The guy at http://www.misco.co.uk/product/OB188766/GOTAB-10-LED-TABLET-1-2GHZ-512MB-RAM-4GB-ANDROID-4-0-OPEN-BOX-BOX-AND-PRODUCT-PRISTINE provides everything you ask for, the ethernet, arm/disarm app, realtime alerts (sms, voice) and using your existing panel too. Cheap as chips.
Dimension all the way, shed loads on ebay for a really decent price. Just make sure you get one with a recent software version.
2x System Armed / Disarmed (Set output)
2x Intruder Alert (intruder output)
2x Duress / PA (Pa output)
1x Motion, even when the system is disarmed (ready output)
1- Whats a wireless GB? Is it glass break? If it's a single device you want to connect to a single zone on your panel then you could get a single zone receiver.
Such thing as
http://www.visonic.com/Products/Wireless-Property-Protection/Glass-break-detector-mct-501
and
http://www.visonic.com/Products/Wireless-Property-Protection/Receiver-mcr-304
2- Keypad PA function is *2 I think, don't remember what *0 is. It's silent PA though.
While adding the rules to the router you haven't put anything in the trigger port have you? AFAIK its just start and end ports need filling(and udp/tcp) before clicking add.