For a high level chameleon, or any caster with access to Faerun, take a look at Lost Empires of Faerun page 33. Shalantha's delicate disk is a level 6 sorceror spell that creates a disk that stores a spell permanently up to 5th level. The spell is released when you break the disk. So start your collection of spell frisbee's. There is no limit to the number that you can have. You can even make a huge sac of them full of fireball and shatter spells. Hurle that sac, at least a few of the disks will break and only one shatter is needed to set the whole lot off. You can also pass out heal disks to the party copying heal from the adept list. These disks really work best for divine spells since you dont have to have them in your spell book to gain access to them.
Factotum does work for crafting feats, even taking 5 levels of artificer on the way into chamelon can be done to get more feats. You can always use the floating feat for Magical Artisian or other xp/gp reducing feats as needed. The artificer is good also since it gets a +2 to effective level for crafting. Practiced spell caster can give you another +4 boost. Also Illumians from races of destiny can get another +2 caster level and have the human subtype qualifying for chameleon. That gets you to an effective crafting caster level of 12 by level 10.
Also if you want to craft on the cheap and have a good alignment, i would go with ancestral relic as a feat. Ancestral relic lets you pray at an altar and sacrifice materials of equal value to add the same value in enchantments to one item. The max amount the item can be worth is equal to half your level based wealth from the standard wealth per level table. Note, it is only the current value of the item that is limited. Fire up a wall of salt which is worth a ton of money (look up salt prices per lb in the players handbook) and start praying. I would suggest your item is your spell book which allows a few things. First you can pray up scrolls really fast and copy them over for your arcane spells. Read the scroll when you are done, and the magic value of your book drops right back down. Second, at higher levels start praying up stat books. You get the stat book ready, read it, and all the magic is gone. The item's value once again is base and ready for a new stat book to be applied to it. This is also an excellent trick for a good self reliant archivist. Best of all you dont need any crafting feats, spell access, level requirements, gp, or xp to make your item. The downside to that is you cannot speed things up with the reduced crafting time feat from eberron. If the DM gives you a hard time about salt, just keep your portion of the loot in magic items. Magic items sell for half value, but sac for full value.
