The answer
Potential approaches using account abstraction and upgradeable validation may allow key changes while preserving account identity, but exact capabilities depend on deployed standards and wallet design.
What to do next
Treat future wallet upgrade promises as provisional until the code ships.
Ethereum wallet overview
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Trezor hardware wallet
A current-generation hardware wallet for managing keys; it does not make Bitcoin or Ethereum quantum-resistant or resolve a future protocol migration.
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