Actually there is a product that might let you use that top triple with the stock european clipons. They're called 'fork tube extenders' or something similar. I can't remember where I saw them, but try google. They are a big slug of 41mm OD aluminum that is basically a very very thick fork tube cap. You would not have to change your fork position and these would stick up enough so you could clamp the clipons to them.
Now, if these things would be strong enough for this purpose, or if they have the proper threads for our fork tubes, I have no idea. I just came across them when I was looking at changing bar position, might be something you would want to consider.
Regards,
Steve