I Agree with Albedo, though I have two alternatives that may work for you.
Also, Albedo was wrong about oen thing: you do loose a little(VERY little) with the change. Pros and Cons of each alternate have been included.
I'll compare each one to your current character, instead of comparing them to each other. The first one is more caster oriented, the second is more Rogue/Attack oriented (though the differences are slight)
Also, One difference I'll point out between the two of them that may be missed is that although both have CL 12 and the ability to cast 4th lvl spells, the first one gains 1 additional 3rd and 4th lvl spell slot/day, and knows an additional 2nd, 3rd, and 4th lvl spell over the second one.
[sblock=Sorc6/Rogue3/Trickster3]
CONS:
You'd have to find 7 skill points each for Decipher Script and Escape artist.
Loose 6 skill points.
Loose 2 HP due to HD drop
Loose Uncanny Dodge (Personally, this is the only one I'd actually hesitate over)
PROS: Sorc casting lvl 9 (Caster lvl 12), allowing 4th lvl spells (Upgrade from your current CL11 and 3rd lvl spells)
Ranged Legerdemain 1/day
Impromptu Sneak Attack 1/day
+1 Fortitude Save + 2 Reflex Save + 3 Will Save.
[/sblock]
[sblock=sorc6/rogue4/Trickster2]
CONS:
You'd have to find 7 skill points each for Decipher Script and Escape artist.
Loose 2 skill points.
Loose 1 HP due to HD drop
PROS: Sorc Casting lvl 8 (CL 12), allowing 4th lvl spells (Upgrade from your current CL11 and 3rd lvl spells)
Ranged Legerdemain 1/day
+1 BAB, +3 Reflex Save, +3 Will Save
[/sblock]
Also, This has been proposed as a one-shot, so Craft Wands is probably going to be practically useless..