So, I'm creating an optimized Rogue-Druid combination for an extremely in-depth homebrew campaign. Normally I wouldn't use this kind of build, but there are flavor reasons for doing so. This is the lay-out I have currently (+2 Racial LA from Fey'ri fully bought off):
Druid 2 (Dragon Compendium Urban Druid variant -- 1st level only) / Rogue 1 (Wilderness Variant) / Planar Shepherd 10 / Face in the Dark 2 [Campaign homebrewed PrC -- 9/10 divine progression, 1st level no casting progression]
I'm using these items to help with the prereqs for classes:
Wild Shape Amulet [40,000 GP, Throat] (Faerun, 167): You can wild shape as if you were a druid of four levels greater, to a maximum of 20.
A pair of +2 Deadly Precision Daggers (Complete Adventurer, 127)
As it stands I've traded away 2 levels of my druid progression. With the Natural Bond feat and Wild Shape Amulet I can handle the animal companion/wild shape progression, since those compensate for it. Please also note: The feat from Complete Scoundrel that combines Rogue/Druid levels is not allowed by the DM.
My problem, however, lies in that I'm not fond of losing 2 levels of spell-caster classes.
So, to the root of my question:
Is there any way (Items, Feats, etc) I can regain these two levels? This really applies to all multiclassing losses of caster levels. In all my research and reading I do not recall coming across anything that boosts actual Spell Casting, not just CL.
Note: It must come from one of these sources:
Core: DMG I-II, PHb I-II, MM I-IV and the EPH
Deities & Demigods
Races of: The Wild, Stone, Destiny, Ebberon, Faerun & Dragon
Complete: Adventurer, Arcana, Scoundrel, Mage, Divine, Champion, Warrior & Psionic
Tome of: Battles & Magic
Stormwrack
Sandstorm
Dragon Magic
Magic Items Compendium
Spell Compendium
Draconomicon
Drow of the Underdark
Campaign Setting: Ebberon and the Forgotten Realms
Fiend Folio
Unearthed Arcana
Libris Mortis
Heroes of: Horror & Battle
Fiendish Codex I & II
Lords of Madness
Book of: Exalted Deeds & Vile Darkness
Dragon Compendium
Miniatures Handbook