@Bussengeist If your Paperwhite SE is on firmware not newer than 5.16.2.1.1 ( = if it is jailbreak-able) you could jailbreak it and after that you can downgrade the firmware to older version.
Without jailbreak you can't "downgrade" firmware to an older build.
IIRC those idiotic changes of how collections work happened somewhere around firmware 5.14.3.
Not sure about Paperwhite SE but "regular" 8GB Paperwhite 11th gen (aka known here as "PW5") definitely had firmware 5.14.0.1 as the initial, factory firmware build
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