You can use CoinBin or CoinBin Clones to do this. And there is nothing wrong with waiting, miners will pick it up since there is no such thing as Zero mining fee. Accelerators should be thought of as a scam. Transactions will get stuck but when you are use to looking at the mempool and you know the whole cycle of Bitcoin transaction from creating through verifying through signing through Broadcasting. You are good to go.
Didn't know about Coinbin. Thanks. So this would have allowed me to do the RBF without waiting for Bitcoin Core (from where I had initially done the transaction) to sync? Will look into it for next time.
We agree on the fact that the pricing of accelerators seems scammy. But if they do, it means there are people willing to pay. So why not :)
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