moritheil,
Your total gear value should go up to 24,000 total, not 24,640.
Duoane is right, I'm not sure the boon is calculated correctly. If understand, the shield goes off every time its drawn? So essentially you will always have it, yes? Did you get the "draw to cast shield at L1" from the MIC? If its in there, I'm not familiar with it.
As it is, your could get it as a 3/day use activated for 4000X3/5 = 2400. Pretty close to what you were aiming for, but you'd need to push a few gold around. I would then let you upgrade it to be any number of times per day at a later date for the difference (in this case 1600). Arguable it would still be under-costed since a +3 buckler would cost 9k, a +2 animated h. shield would cost 16k, and the ring of force shield is 12k (and only a +2). Still, it could be dispelled, only lasts 1 minute, and requires that you draw your weapon to "cast" all of which limit the ability in what I think are interesting ways so I'll allow it at the above prices. One other limitation: If it absorbs a magic missile spell, it is dispelled until redrawn.
There, done! I'm pretty happy with it.
Also, the gnome illusionist variant is pretty balanced, but I'm unfamiliar with it. Which book is it taken from?
My recollection as to whether the gnome would be a full caster is a little bit fuzzy. I think they will be a bit behind since the Master Spellthief adds the arcane caster level to spell thief spell-like ability caster level I thought. The Master Spellthief feat isn't in the crystalkeep pdf I have, so if you have the time, could you transcribe the text into this thread? Thanks.
The tabletop vesion of EotLQ has a spellthief and its worked out nicely, but they also had swordsage, a scout, and rogue at one point. Talk about stealthy!
I see what you mean regarding the deficiency in disable device/open lock. You'll just have to find and disable traps the old fashioned way; by setting them off
Good thing you have a barbarian.