Druids can use a Gnome Hooked Hammer. They only have restrictions on armor and shields, not weapons. However you wouldn't automatically have profiency with the GHH since Druids don't have profiency with all martial weapons. You would need to take Exotic Weapon Proficiency (GHH) to avoid the non-profiency penalties.
I think Ancestral Weapon Mastery would actually be a better choice than Exotic Weapon Proficiency since it would get you proficiency with both the Gnome Hooked Hammer and the Gnome Pincer.
or take heirloom weapon trait, since it's a martial weapon for you the trait will work with it.
That's a good idea. Exotic Weapon Proficiency and Ancestral Weapon Mastery couldn't be taken until the BAB is +1, but Heirloom Weapon could be selected at 1st level.
It's a martial weapon for for gnomes so Martial Weapon Proficiency is enough.
Oh, yes. Martial Weapon Proficiency doesn't have any prerequisites so it can be taken at 1st level. Very clever!
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or take heirloom weapon trait, since it's a martial weapon for you the trait will work with it.
Though that trait only applies proficiency to that particular weapon, not to replacements of the same type of weapon. So if later purchase one made of special materials, the trait won't apply to the new weapon.