It's probably easier to have us approaching avex for a multi-artist event over just seeing Ayu.
I've spoken to someone in there about the possibility of an artist coming overseas and the expenses will be high, so their main concern (as it would be for any business) is the money output won't match what people pay to see her. avex does not promote overseas because they can't see the point (they won't even let people put up avex artist posters for promotion!), so why would they go and spend a few hundred-thousand sending just one of their artists?
Because we all buy her CDs because we found out about her on the net or through other artists, avex doesn't see the point in spending big to promote a foreign artist when they don't even have posters in overseas stores or give permission to show PVs for free promotion?
I think the best way to get this happening is to have 6-7 avex acts travelling together to various cities, then having a mini-concert each versus trying to convince avex to send Ayu on her own. Having multiple acts together guarantees avex more interest because some will go to see the multiple acts , thus the attendance rate will be higher.
There's a Korean music thing happening in Sydney, Australia on Nov 11 and I intend on being there. Perhaps it'll be a good chance to see what the power of multiple acts is and if it's well-managed

Good testing ground, so to speak!