Support for non magical weapon modifications

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https://www.d20pfsrd.com/equipment/weapons/weapon-modifications/

Some smiths or inventive adventurers are unsatisfied with traditional weapon designs, adding custom improvements to the weapons they craft. These modifications are added to mundane weapons after creation at the listed cost, but modifying magical weapons increases the cost of modifications by 50%. As with enchanting, modifications are applied to ammunition in sets of 50. A weapon can normally only bear one modification at a time.

After being modified, a weapon’s category (simple, martial, or exotic) increases by one step. While a character proficient with all martial weapons can use a modified simple weapon without additional training, modified martial weapons require the Exotic Weapon Proficiency feat to use without taking penalties. An exotic weapon that receives modifications cannot be wielded without the Modified Weapon Proficiency or Weapon Adept feat. A character proficient with a specific weapon (such as a cleric’s proficiency with her deity’s favored weapon) is not automatically proficient with a modified weapon of that type.

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some of these have mechanical effects we cannot code, like dual weapon, but can add description labels and cost

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Brutally Weighted Price +1,500 gp; Weight +1 lb.

A brutally weighted weapon is balanced to put more weight on the striking surface, knocking targets off balance with every blow. Only bludgeoning melee weapons can be brutally weighted. This modification can be added to a greatclub or tetsubo without increasing its weapon’s category, but doing so increases the cost of modification by an additional 1,500 gp. A creature hit with a brutally weighted weapon takes a –2 penalty to its CMD against bull rush, reposition, and trip combat maneuvers until the end of its next turn or until after it is subject to such a maneuver (whichever comes first).

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Dual-Balanced Price +2,000 gp; Weight —

Dual-balanced weapons are balanced to be wielded in tandem.

Only melee weapons can be dual-balanced. When wielding two weapons with the dual-balanced modification, reduce any two-weapon fighting penalties by 1 for both weapons. The weapons do not need to be the same type, but both must have the dual-balanced modification.

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Jagged Hooks Price +1,000 gp; Weight +1 lb.

Brutal hooks and barbs are worked along the weapon’s blade or length. Only piercing or slashing weapons can have jagged hooks. Projectile weapons can’t have jagged hooks, but their ammunition can. A weapon with jagged hooks deals additional damage equal to the weapon’s critical hit multiplier on a confirmed critical hit; this additional damage is added to the final total, and is not multiplied by the critical hit multiplier.

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Razor-Sharp Price +1,000 gp; Weight —

The weapon’s edge is honed to incredible sharpness. The weapon’s edge dulls after a number of daily uses, but the bonus can be reset by spending 15 minutes whetting the blade after a night’s rest. Only piercing or slashing weapons can have the razor-sharp modification. Projectile weapons can’t be razor-sharp, but their ammunition can. A razor-sharp weapon gains a +1 bonus on weapon damage rolls for a number of attacks each day equal to 3 + your base attack bonus.

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Serrated Edge Price +2,000 gp; Weight —

The weapon’s blade inflicts wounds that bleed profusely. Only piercing or slashing melee weapons can have a serrated edge.

This modification can be added to a sawtooth sabre or rhoka sword without increasing its weapon category, but doing so increases the cost of modification by 2,000 gp. When you make an attack with a weapon with a serrated edge, you can take a –2 penalty on the attack roll. If you do and the attack deals damage, the weapon also inflicts 1 point of bleed damage. This bleed stacks with itself (to a maximum equal to the weapon’s critical multiplier), but does not stack with bleed from other sources.

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Tactically Adapted Price +2,000 gp; Weight —

A tactically adapted weapon is designed for specialized tactics rather than just swinging and stabbing. Only melee weapons can be tactically adapted. When this quality is added to a weapon, choose a weapon quality from the following list: blocking, brace, disarm, distracting, nonlethal, performance, or trip.

The modified weapon gains that weapon quality.

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Versatile Design Price +500 gp; Weight —

A weapon with the versatile design modification is easier to wield for those skilled with other weapon groups. When versatile design is added to a weapon, choose a fighter weapon group. The modified weapon is considered to be a weapon of that weapon group (such as for the fighter’s weapon training class feature). A melee weapon cannot be considered part of a weapon group for ranged weapons, and vice versa.

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Tactically Adapted

this could be interesting on it having numerous ways of working based on weapon qualities

whether it's

• Tactically Adapted Longsword
• Tactically Adapted (blocking*) Longsword
• Blocking Adapted Longsword insert weapon quality of choice or something else