I wouldn't call myself a super-super Gackt fan, but I am a pretty big one. I know about as much about him as I do Ayu, so it might not hurt to contact you. =)
If you have an LJ, there are some really great Gackt communities that can answer a lot of questions for you. The one I read is "Dears" and their address I believe is
http://livejournal.com/community/dears