No, RBF would have failed because Lightning channels are 2-of-2 multisignature wallet scripts. If OP was successful with the RBF, then that would have permanently confused both channel partners, since the transaction would have been maleated to a new transaction hash/ID - basically Mt. Gox-ing yourself.

CPFP or a miner bribe/MEV (i.e., Mempool.space Accelerator) are the correct ways to solve the predicament.