A perpetual futures market lets AMPL holders hedge against negative rebases, and opens up margin trading both long and short. If there is enough liquidity, the funding rate should signal the expected price direction.
AMPL trades and rebases around the target price of the 2019 CPI PCE US dollar. This puts an upper and lower bound on the price range, so margin traders can use higher leverage. This should give an AMPL perp the required volume to stay listed on a perpetual futures platform.
Use AMPL’s existing price oracles to list it on a perpetual futures platform like https://trade.polynomial.fi/ or Synthetix - Decentralized Perps. Optionally, the DAO can bootstrap liquidity for this market.