ACP-224 proposes pulling in the ACP-176 fee mechanism into Subnet-EVM, and adding an ACP224FeeManager Precompile implementation to allow for Subnet-EVM chain's to maintain the same level of configurablity as they have today with the existing FeeManager precompile.
Rough reference implementations of the AvalancheGo and Subnet-EVM issues can be found here:
ava-labs/avalanchego#4286
#1733