I'll throw out my suggestions for what I would be content with.
Favored Soul required 2,500 favor to unlock. How about a 3,500 favor unlock for the Artificer during u11 (or 3800 favor - since current max is at 3767 favor) which will lock out when u12 will allow for a Cannith favor unlock.
or
It's easier to take away than to give more. Make Artificers a VIP exclusive purchase only at launch until such time Artificer can be unlocked with favor. It provides an incentive for f2p and premium players to try VIP if they didn't want to wait 3 months to buy Artificers.
or
Provide Artificer access to VIP until such time favor is available to unlock.
or
(This would kind of make sense) make the Artificer available for 500 tp for a VIP player at launch and raise it to what the premium and f2p players pay. A VIP player gets 500 a month anyway, and they can chose to use their months worth of free tp to unlock the Artificer.