Personally, I think spell resistance is one of those awesome things that PCs just can't normally get, so that totally could be worth 3 Eldritch Heritage (Aberrant) feats for spell resistance that increases with level. The acid ray is kind of pointless but the resistance to crits & sneak attacks could come in handy. I'm not sure about the extra reach with touch attacks; what sort of touch attacks would a non-sorcerer be making that would be worthwhile? Especially when that person already has to have a great charisma?