Friend moving away, gift giving, phrasing, What do I say?

I have a friend (a good friend) who is moving quite far away later this year. I want to give him a gift, a "going away" gift. I have a problem though. I'm really attracted to him, and he KNOWS it. He is NOT attracted to me. I need help with HOW to phrase what I say to him when I give it to him, so he will not refuse it or think of it as a "come on" or "trying to get lucky" or whatever you want to call it. It is a gift I want to give him, because he is my friend. I do not deny that I like him (a lot) and that I have in the past made some pretty transparent attempts at trying to sway him into liking me in the same way. I have been crude, too honest, pushy, etc, and he has turned me down harshly. YET, we are GOOD friends (he just tells me to CHILL OUT - a lot). What can I say to someone who I truly WILL miss when I give him a gift from my heart, so he wont refuse the gift on the basis of it being from me? I have already purchased the gift. It is not inappropriate, and I know he will like it, and would likely love it if it wasn't coming from ME, specifically. I want him to know it would be my honor that he accept it, but I am also tempted to tell him I will not be refused on this matter. I do not want to allow the possibility that he would refuse it. How can I tell him it is a gift without any attachment or implications or expectations, and make him understand it is from my heart (not the broken part, the HONORABLE/SINCERE part)? I don't want to mess this one last in person contact with him up with my female to(towards) male emotions and my pion for him.