Nope, at least not as described here since RescuePack and Coward's RescuePack are not compatible with that Kindle model (or any of the newer Kindle models since PW4).
If your main reason for wanting to downgrade is the new UI since you have jailbreak maybe test this?
Code:
https://www.reddit.com/r/kindle/comments/tl4tle/reverting_to_previous_ui_versions_on_5142/