In Bitcoin Core (or Electrum), when sending a transaction with "Enable Replace-by-fee" checked, is it possible to resend the transaction (before it was mined) with a higher fee AND to another address?
Such a transaction is standard and would relay. However neither the Bitcoin Core wallet (via the
bumpfee command) nor the Electrum wallet (via the GUI) would create such transaction.
More information about fee bumping in the Bitcoin Core wallet can be found here.