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Removing the wing skin involves lots of screws, but you will want to replace them when you remove them. If you do it carefully, it is labor intensive, but you won't have to replace the wing skin.

If the wing is riveted along the leading edge, you remove the the screws and gently lift it up to do the dye penetrant inspection. In that situation it makes sense to drill the hole. If the wing has screws along the leading edge, simply remove the top part of the wing skin, and you shouldn't have to drill the hole.

My former aircraft had rivets on the leading edge of the wing skin, and Herb's plane had screws along the leading edge of the wing skin.
You do not have to remove the tanks.