I'd like to see that.....
I don't think it can be done, as the large port is bigger than the small port by more than the wall thickness of the runners, it's a MASSIVE difference!
I think if it were that simple Tufty and Welly would have done that years ago, especially with Bills talent for porting the crap out of everything!
It's only the end part of the mani mate, right by where it meets the gasket. The car that the head is coming off has a similar arrangement as it's a k04 with an AGU lump, saves the need for the phenolic spacer and seems to work o.k.