Good point about swapping out the Datatool, although I know that most alarms come with all black wires with sticky labels on - the point being that you don't know which wire is which if you're trying to hotwire it. It might make swapping one out a complete nightmare!
Have a shop around - the Meta has been out for a while now (at least 4 years) and you should be able to pick a kit up fairly cheap. Getting it fitted shouldn't cost you too much. I know that TecMoto do an alarm fitting service - it might be worth just giving them a call?
http://www.tecmoto.co.uk/