Check your copy of the PHB II. Look at the Teamwork Benefits; more specifically the one that grants you Evasion against your allies' spells; now iirc, the Evasion class feature has a clause that states that if you already have Evasion, you gain Improved Evasion.
It doesn't state that if you have Evasion for only one source of Reflex Saves, you only get Improved Evasion for that source.
So, in essence, you have Improved Evasion at level 2.
Please, if there is a problem with this, please tell me.
Oh, and thank you PBMC for the idea.