From what you've said about your character, it seems that they should be a diviner, with a "sub-concentration" in enchantment. I think the loremaster PrC fits in really well with your character design. You scower the world looking for knowledge, get a bardic lore like ability, and even 2 bonus languages, not to mention the all important full caster progression. It's a realitively high level PrC though, as you can squeeze in at 7th level if you take only the feats required to get it. If you don't want to be pushed into the blaster roll, Ban Evoc.

I actually did something similar in the last camaign I played in, I was a transmutor, banning ench and evoc, honestly, I got bored of it. At low levels you may feel very ineffective during combat, but if the game is RP heavy, it really shouldn't make that big of an impact. I found taking extend spell at low level to be quite worth it. Try and take either de-buff or buff spells so you have something to do in combat as well.

Best of luck.