How is using a scroll the same as casting?
If you can sneak it past your DM?
Alternatively, there is the metamagic wand grip...
Another decent wand choice is a wand of Siphon, combined with Unfettered Heroism, a Metamagic Wand Grip, and Wand Surge.
Spend 9 charges 3/day to regain a 9th level spell? Nice, especially since you can also alter lower levels too.
Replace the Metamagic Wand Grip with the Metamagic Spell Trigger feat.
Might be hilarious with an Incantatrix, if the Incantatrix's Metamagic abilities work with Metamagic Spell Trigger:
"Oh, woe is me, I have just used all 4 of my 9th level spell slots... (expends 16 charges off of the wand) Oh wait, silly me, I've got them back."
Add in the fact that wands are cheap as all get out, and you have yourself a rather epic wand user, if I do say so myself.
Too bad you can't recharge wands, because that would be fun.
Hmmm, now to figure out this guy's equipment... Rod of Many Wands, anyone?