So, let's say I'm playing your bog-standard 'burger truck' demon eidolon. By 12th level, I've got 5 attacks (the maximum): a tail with a stinger, some wing buffets, and the claws Lamashtu gave me. Great.
Now, at 19th (!) level, I'll have 7 attacks maximum, and let's say I mostly want to preserve my burger truck allure (so, no tentacles, no extra arms if I can help it, etc.). What options do I have?
As far as I can tell, the best option would be a gore attack and a bite attack (costing 3 evolution points). And the nice part is there are a number of creatures that already do this gore-and-bite routine: a bunch of dragons, gargoyles, and even some types of demons. So that sort of combat is well-established.
When I think about what sorts of appendages I'd like to wiggle at people in order to hurt them (uh, for physical hit point damage, at least), if I had a choice, I'd rather not use my actual head. I'd much prefer, say, to use my legs instead. For one thing, they're longer. For another, if I happen to be 12 feet tall during a moment of duress, I'd much rather step on some do-gooder halfling than bend down and bite him. Somewhat undignified, I might say.
Question 1: Could I (an unchained eidolon) take the hooves evolution from Ultimate Magic? Could I take other evolutions from pre-Unchained books (other than the APG)? Could my summoner learn spells that are summoner spells but don't appear on the unchained summoner list in Pathfinder Unchained (such as the best one, lesser infernal healing)?
Question 2: Can a bipedal eidolon (with only one limbs [legs] evolution) take the claws evolution on their feet? Every other biped (in the hardcover bestiaries at least) with 'feet claws' have them listed as 'talons'. If you can take 'feet claws', would they just be talons instead of claws?
So a single head can hold a gore attack and a bite attack.
Question 3: Can other combinations of 'one appendage two attacks' work as well? Even though there are no creatures in bestiaries that do this, would tail slap-and-sting work? Or claws-and-slam?