Yeah this could be interesting, although it would require a new UI feature, and I'm generally against any part that requires a new/unique UI of its own.
That and it can be more of a challenge to try to work with what you've got. Of course if it's not guaranteed then that doesn't matter too much, not to mention adaptability and flexibility are certainly in tune with Cogmind's theme...
So far the only way I can see doing this, in order to avoid the UI dilemma, is perhaps changing your evolution behavior such that if you have this thing you can instead rearrange all of your slots when you next evolve (like at least once--say that's when you're more "malleable").