You could take elemental companion ACF and equip it with normal tools. It is intelligent enough to use them.
Alternatively you could chain Polymorph Any Object your companion into a Pit Fiend.
Or you could use companion as crafting aid. Instead of getting magic crafting feats yourself which are too many to choose, you could load feat on your companion. And when you need another crafter feat you could resign old companion and conscript new.