Unable to find a way to RBF a transaction

As a continuation of my previous issue, I tried to follow this guide: https://docs.corelightning.org/docs/faq#how-to-forget-about-a-channel

I swept the funds but forgot to set a feerate=urgent as I just copied and pasted the command. Now the transaction with 2sats/vB is of course stuck in the mempool.

To my surprise there's no way to RBF with a simple "bumpfee" like bitcoin-cli operates. Also there's no way I can find to create a raw transaction to at least spend a UTXO and replace the transaction. I can't imagine this is a problem nobody ever found and that has no solution.

How do you go about bumping a fee with Core Lightning?

Thanks in advance again.