Not sure how this would work specifically, but this might mitigate some of the soreness of pure classes struggling to stack up against multi-classes and dips.
The biggest source of woe for pure classes seems to be:
- lower saves
- lack of wand/scroll use
- evasion access
- tumble / AoO immunity
It feels like giving Evasion and UMD via feats to classes that wouldn't normally get access to them might help mitigate this.