I would approach this situation a little differently, I would send a quick note to the owners in the fourth and fifth spots, asking them if they are interested in trading for your pick. Then about the same time or maybe a day later or two later(if you prefer), post on your league's website in the trade bait and let everyone know of your interest in trading down. The reason I suggest this is there may be a contender or near contender in your league or an owner who may have a crush on a certain player, and are willing to pay a king's ransom to get the third pick. Why eliminate that trade possibility? If they don't make an offer that interests you, you are not committed in trading your pick.
For example, maybe the Watson or Brees owner may want to jump up in the draft and over pay to move up to ensure that they draft a good QB. Not all 12 team league has the same scoring rules, I pay in a 12 team league where the QB scoring is very favorable compared to other positions
Maybe some team have incredible depth at a certain position or two, but strongly desire your third pick. Again possibility to improve your team.
Bottom line is, you don't know what all of your league mates are thinking. Why reduce or eliminate a chance of a great trade for you?