Hi! Your gift wrap idea sounds lovely and perfectly appropriate. Just an idea, one of my favorite gift wrap techniques is to also use two different types of paper. I wrap the entire present in one paper, and then make a band around the middle (two ends open) with a contrasting paper, and then a bow that coordinates with both papers. They will be VERY impressed with you.
I don't know what the official ettiquette books say, but I typically address a wedding gift to both the bride and the groom. The only time I list just the bride is at a ladies shower (where the groom isn't in attendance.)
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