Four tested templates. Each is fixed Solidity with immutable configuration supplied through constructor arguments. Pick one and set its parameters.
Collect a configurable fee after every swap and route it to a specified address. Charged on top of, and separate from, the pool LP fee.
Before each swap, compare the swap size against a threshold and override the LP fee: a higher fee for large swaps, the normal fee otherwise. Requires a dynamic-fee pool.
The LP fee starts high at the pool's first swap and decays linearly to the ending fee over the configured duration. The maximum fee is always the starting fee.
Before each swap, reject it if the specified amount exceeds the per-swap maximum. This limits swap size, not wallets: hooks see the router, not the end trader.