Making Natural weapons upgradeable

[salcor]

Everyone,

So I am still working on putting the Aliens and Adversaries Sci Fi Bestiary into Hero lab, partly to educate myself. But I had a question, is it possible to make a natural weapon upgradable under the sci fi rules? For people that have the document I got the Crystar race working, but I was looking at the Crystar Avenger NPC that has the basic crystal claw attack increase in damage and AP.

Any thoughts on how to make this item so it can be modified?

Salcor