You're serious???
Well anything can be done given time and patience. The most important thing though, will be money. You're looking at ive figures from the off mate I would say. You will need to transplant as much as possible from the Aston, and last time I checked, most Astons dont have much in common with mk3 Astras... apart from the fact they both have wheels.
If it is something you have to do, like the guy who put a TVR engine in a mk2 golf, then be prepared for a very long struggle...
As for starting a car with NOS I wouldn't suggest it as the components of the engine will be cold and I predict blowing something if you get it wrong.
Why would you start a car with NOS anyway?