Slashing Grace feat (from ACG) does not allow slashing weapon to be treated as piercing for class abilities and feats (e.g. Swashbuckler Weapon Training)
The Slashing Grace feat is supposed to allow a slashing weapon to be considered piercing for purposes of class abilities and feats (such as Swashbuckler Weapon Training or Precise Strike). However, if you create a Swashbuckler (min 5th level) and give the Slashing Grace feat with the scimitar (a slashing weapon), you can't add the Temporary Bonus for Swashbuckler Weapon Training or Precise Strike as it says you don't have an appropriate weapon. Those two class abilities only allow you to add it to a weapon that has the "Piercing" type, which a Scimitar does not and which Slashing Grace does not change.
POST FORMULA REPLACEMENT WORK – When Equipment Conversion takes place.
Equipment types and proficiency types are immutable after you load. No feat or class feature can change that currently.
Individual equipment types will need to be placed in an array in the new system.