Humayun,
Steven Mogg is the local guy who will have what you want. I am not sure about the barlow and lens idea, too hard. If you really must, then use a Canon (or similar) converter. With your impressive arsenal of EF lenses though I am sure you will find something that works. I have been using a converted 8x50 finder, just the objective no eyepiece, so it is a great system to try.
Gary
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