I think providing the transaction hash (txid) will be appropriate, or Sauaba should track the transaction on blockchain explorer, because if the transaction is not support replace-by-fee, he will not be able to neither cancel the transaction not pump the fee.
RBF has been been enabled by default in Electrum for the last 3 years, so I think we can safely assume that it will work since OP mentioned that they had made several transaction in the past two years.