For making the replacement transaction using coinb.in, click on "New" at top of the page and then go to "Transaction".
- Paste your transaction ID and click on "Load".
- Add/remove addresses if you want to change the receiving addresses.
- For changing the transaction fee, you should change the value of outputs. (The transaction fee is the inputs value minus outputs value.)
- Click on "submit".
- Copy the unsigned raw transaction
- Click on "Sign" at top of the page.
- Enter your private key and paste the unsinged raw transaction and click on "Submit". It's recommend to do this step offline (preferably on an air-gapped device)
For making the replacement transaction, you can also use electrum.
This part is actually my method on rebuilding transactions and saw that you can uncheck or check the RBF but for replacing the transaction I think I'm going to try this on Bitcoin core and run it with "-mempoolfullrbf".
I got the idea during research yesterday about the solution for non-rbf transaction and I came across to this post below and they mentioned about -mempoolfullrbf which accept transaction replacement without the original transaction replaceability signal.
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https://bitcoin.stackexchange.com/questions/115360/is-it-possible-to-set-rbf-as-always-on-in-bitcoindDo you think this would work on my own node instead of doing it to Electrum?