I’m not sure I would group these all as a single feat. The normal weapon proficiency feat grants proficiency in a single weapon.
I think I would go about it like this. Use the standard WEAPON PROFICIENCY feat with the following new weapon stats.
Weapon…......…Proficiency…....Damage.….....Range…........Group….........Properties
Armor Spikes………….+2…………………..1d4………………------…………..Unarmed……….Off-Hand
Light Shield…………...+2…………………..1d4………………5/10……………..Shield…………….Off-Hand, Heavy Thrown
Heavy Shield…….…..+2…………………..1d6………………------…………..Shield…………….Off-Hand
Note: Spikes is a generic term that encompasses, spikes, studs, razors, etc. added to armor to make it function as a weapon.
I think I would go about it like this. Use the standard WEAPON PROFICIENCY feat with the following new weapon stats.
Weapon…......…Proficiency…....Damage.….....Range…........Group….........Properties
Armor Spikes………….+2…………………..1d4………………------…………..Unarmed……….Off-Hand
Light Shield…………...+2…………………..1d4………………5/10……………..Shield…………….Off-Hand, Heavy Thrown
Heavy Shield…….…..+2…………………..1d6………………------…………..Shield…………….Off-Hand
Note: Spikes is a generic term that encompasses, spikes, studs, razors, etc. added to armor to make it function as a weapon.