Hi King
Hmmm, that is a dilemma. I wouldn't want to lab a hissi either. The chia you could use general weapons for, you don't have to go species specific. That could actually save you in the long run if you are going to lab your battle pet.
Species-wise, kacheeks, elephantes and lupes(?) have some nice species weapons/healers. And pteris are easy to heal if someone poisons them - just feed them anything with worm in it. Weapon-wise though, I don't think pteris have anything really special. Nothing I've heard about anyway.
I say go with whatever pet you like or just lab your chia until you can make him a pea, then stop labbing and straight codestone train. Get regular weapons. Just my opinion