Would this work? If I offered to send a gift card FIRST, that is worth more than the bitcoins you offer, would you engage in such a deal? I don't see why not as there is no risk factor involved.
(Hypothetical)
So, good plan or not?
No, it won't work and I'll tell you why no one should exchange in that way. #1 rule never deal in gift cards, 99% chance the card is bought with a stolen CC or hacked paypal, it will get canceled with in the hour, if not within 15 minutes.