Sounds like a good recipe
But why use the fatfree greek yogurt? I buy fullfat (10% fat) from Lidl which is half the price of FAGE in other supermarkets.

As for US recipes having unobtainable ingredients, most of them are available in UK though you might need to do a google images search to identify what name we call them.

And for their foreign quantities, you can download a free software to convert practically anything to anything else.

http://joshmadison.com/software/convert-for-windows/

For weight conversions look on the tab called 'mass'