Can I go back to the stock ROM (rollback protection)

Hi, I want to try IodéOS for a few weeks and I would like to have a locked bootloader. My question now is, can I go back to the stock ROM if I wouldn’t like IodéOS or something doesn’t work that has to work for me, even if IodéOS 5 is based on Android 14 and the FP4 still has Android 13?
Also, if I do the fastboot get unlock ability thing and it would show 0, is there something I could do to get it to 1?

Thanks for your guidance!

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