Not exactly what you’re looking for, but Pocket Tube [1] [2] is a browser extension that lets you organize your subscriptions into custom groups. You can then browse non-algorithmic feeds showing the latest uploads from each group, which makes things much easier to manage and filter.

Hope this helps.

Disclaimer: I’m not affiliated with Pocket Tube. I’m currently working on https://maxxmod.com, a YouTube-focused browser extension, so I’ve researched the ecosystem.

[1] Website: https://pockettube.io

[2] Firefox extension: https://addons.mozilla.org/en-US/firefox/addon/youtube-subsc...