I've been trying this for 2 days now. I would say this works. The simple, boring thumbnails do not trick my brain into clicking the video.

if I lose the patch of my YT again

You can export/import:

1. Applied patches from ReVanced managers: Settings > Export patches selection
2. In-app ReVanced settings: Profile Picture > Settings > ReVanced Extended > Miscellaneous > Import/Export > Export settings
3. SponsorBlock profile: Profile Picture > Settings > Sponsor Block > (scroll all the way down) > Import/Export > (select and copy all the text) > (save this copied text in a text file OR pin it in your keyboard's clipboard) > (Now Go to new app and paste in Import)

I switched from ReVanced Extended (RVX) to ReX using my exported settings. Doing it this way makes switching APKs a breeze.