>>/794631/
That doesn't change the fact that no one pronounces the oo in gook the same as it is in good. You'd either have:
> guks on the perimeter
Or:
> gude morning
Both sound retarded in English. No native speaker would pronounce the oo the same. 
 >>/794632/
> not region
There is still some regional variation but it is mostly class based. eg. Adelaide