For the vendor (non-)consent thing - Consent-O-Matic provides an appropriate framework.
(Whether such a side would even care about the preference/consent is another matter entirely - I’d suggest a throwaway browser identity and cookie auto delete for a start, anyway.)
Creating rules has a bit of a learning curve the first three or seven times, but I find that more interesting to do than go through a hostile/dark pattern cookie dialog or such the third time.
Hm, maybe the appropriate functionality from CoM could be re-wrapped as a TamperMonkey module…
Web automation for the masses 😱
12ft.io and/or archive.is/archive.today/… are worth trying in such cases (assuming you already have the latest version of the current ByPass addon, see the other comment).
Regarding cookie pop-ups, there’s a little known gem: https://consentomatic.au.dk/
You might also want to look into Zstandard - it gives much better ratios in orders of magnitude quicker time on modern hardware.
A bit down on the page you can find versions of the 7-zip graphical archive manager extended with this Zstandard algorithm.
Like normal 7-zip/traditional zip/rar/gzip/bz2/…, Zstandard is completely (guaranteed) lossless.
(I don’t really know about ECM at all, so I won’t speak on that aspect.)
… Which means that businesses are making ‘too much’ money on top to sink into such endeavors, no?