You make no mention on how long the cut is overall. Just guessing, I would try something like a dremel tool, using an abrasive cut off wheel. Great little tool, but you may want to practice on a piece of scrap or something to get a feel for it. As fac as t fixture to hole your copper plate at the correct angle to the tube, why not cut a small block of wood with a hole bored through it at the same angle and diamter of the pipe you are using? Then, starting at the top position, clamp below the block and solder your first fin above the block. The lower the wood block to the next position and solder another one..................
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