Proposal: enforce all sells through an approved router. On every buy, the router records the wallet’s weighted-average entry price and amount. On every sell, it measures the seller’s actual realized proceeds, compares them to recorded cost basis, and calculates realized gain. The surcharge is mechanical: for each 1% gain, charge 1% of that gain, capped at 36% of total gain. No gain, no surcharge.
The router withholds the surcharge directly from sale proceeds, sends the seller the net amount, and forwards the surcharge to a reward distributor. That distributor updates a cumulative reward-per-token index, so remaining holders accrue rewards automatically pro rata by holdings. Direct pool sells are blocked unless routed through the approved contract, making the rule enforceable entirely onchain.