Quote from: yoshimitsu777 on December 27, 2023, 10:40:29 AM

i want to ensure that RBF will not be used at all and nobody can change or cancel that transaction.

RBF doesn't mean that others will be able to cancel your transaction or change something. RBF means that only you will be able to increase fee or cancel transaction by doing double spend. Even without double-spend, if your transaction's fee is very low and nodes forget it, it will be automatically cancelled. The only way to prevent it is to rebroadcast your transaction every time but that doesn't make sense either.
You can use old version of Electrum but keep in mind that soon every transaction will automatically be RBF enabled.

Quote from: LoyceV on December 27, 2023, 02:11:15 PM

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The only way I can see here would be to run a full node, explicitly deactivate full-rbf (not to be confused with opt-in rbf!) and put your transaction in there.

That doesn't matter, other nodes can do full RBF anyway. And miners would be dumb not to do it: higher fees mean more income for them.

Miners will profit more from non-RBF transaction because full-RBF gives everyone possibility to match the fee to what's recommended but when people make non-RBF transactions with low fee, they have to use 3rd party services like mempool.space accelerator, paid ViaBTC accelerator, Binance accelerator and so on. These services are partnered with miners and together charge ten times more than what would be necessary via simple RBF increase.