Oops - yes I see the flaw in my line. I actually changed it at the last minute by cutting and pasting the order and didn't read my post through as I got a phone call at work. Honest gov!

Revised to my original plan:
win AC
Play AKQ of hearts pitching 3 clubs.
small to AD,
Rough a diamond
Back to table with AS
Cash 2nd round of trumps
Rough a diamond high
Rough a club to get back to table
Play diamonds from top.
Alex - trying to understand your suggestions. I think your first attempt you come down to the following 2 card finish (in hand)? This only works if 3rd spade is in the same hand as 4 hearts as you will be overruffed?
T
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x
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xx
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Your second attempt seems similar to my line albeit with a slightly different order?