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How about ribbon cables? They are flat.
Also, not really a “no hole” solution, but what about making “terminal pads” as on backplate of Kindle Touch (1st generation) used for providing power to a lighted case, for example? You could make two very small holes, but put two metal round pads which will be connected to the motherboard. You could also make some sort of “dock” for this thing, and customarily increase the resale value which you are concerned about.
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