ri5,
The hour building sounds like a good sensible idea,but I think you`d probably learn more if you did fewer hours in more locations..75 hours in one place would maybe not be as beneficial as 25-35 hours in different locations.
I think if your aiming to go commercial,each flight should be educational and challenging..and lets face it,your going to know the area like the back of your hand pretty quickly..and bad habits might kick in,if you move around a bit,you`d always be on your toes and more alert.
How long will you be doing the hour building for??..75 hours is alot,hope 4-5 weeks at least planned or your going to burn youself out!!!
FAA IR/CAA IMC would seem a good idea..when you come back home..you can make the most of our notouriously bad weather and bluntly its very good challenging fun at times with the IMC,and the FAA IR will give you a great start for your JAA IR.
God luck with it all though.