A copper plate under the stock aluminum board won't do a single thing to help with heat, might even make it worse because it's just adding another interface the heat has to try to get across. The dielectric layer inside the stock aluminum board is what hurts it, not what the board is sitting on.
Link to the ebay listing that ships to Canada is in this thread. Or, browse the seller's other listings. It's in there.
There is no guarantee which driver and which LEDs you'll get. In stock form, when used by normal people, they're all functionally identical (note: we are not normal people). I have bought three lights all from the same ebay item number and one had XML2s, the other two had XMLs. All had the JB driver. Really, the LEDs it comes with shouldn't matter, you need to ditch the original thin aluminum board and stick in 3 16mm copper boards with LEDs already mounted (and you get to choose a nicer tint than anything the light will come with stock). If you keep the stock Al board you might as well leave the driver stock too, since using the stock board means you'll have to reuse the stock skinny wires or else the LEDs will fry, and all you're doing there is eliminating the resistors on the driver and using the wires as resistors instead. Like buying wider wheels but keeping the same size tires.