My ruling will be, the Horns a are a Weapon.
Can be used as a Monk Weapon, but not as Unarmed strike.
So the MinoMonk Hits with weapon, (horn or weapon in hand), then Unarmed Strike with Hand or Hoof.
Might even go as far allowing Hoof to do +1 Damage but with a -1 To Hit, been hit with hoofs, hurts much more than fists
As for the Horns, I can see the Oils and such that works on other Weapons working on them.
As well as perhaps some covering on the tips to help protect them.
When goring I could also see if the Mino rolls badly perhaps having them stuck in a wall or tree. Say a 1-2 Nat on the Hit Roll, if there is something close (10 feet) for them to hit.
YMMV
Now the Panache, and Toujour l’Audace I have more than a few issues with.
Fancy Feet
Even Fancy Foot Work I would like better if it was If you HIT, not just Attack.
TA
The SA when your alone, seems to want to split the party.
This is also very easy to setup to get this most of the fight.
The Assassin Would want this ability as they would almost always have SA damage.
Not sure the change but feel it is a bit over shadowing the base.
Panache
Giving Taunt to a non-Fighter is not the greatest idea to me.
Let alone dual working as Charm.
Will have to look at other 9th abilities but feels wrong for the Quick in and out one to be taunting.
No doubt as written it is a two weapon fighters dream come true.
Start as Human with Feat and your a beast, pouring out damage at a constant rate.
Will let the Stat folks check but should be close to top DPS class.