Posting as a standalone post for visibility.
Some webconsole wizardry to see private vimeo links which are shared on patreon pages, and we can't play directly on kemono.
Credit for the method goes to user stinkerray on another forum.
If any web developer can think of something less strenous (or maybe an automated GreaseMonkey script), feel free to share and improve the method!
The way to play the "private" vimeo videos shared on patreon is to use their embedded player. The tricky part is that we need to get the embedded url, which, even though it's conspicuous when you subscribe to a patreon page, it is not so through kemono.
On top of that, I found that you need to play the embedded video on a patreon page. You don't need to login to Patreon, it doesn't need to be the actual patreon post where the video is linked - it only needs to be a patreon page (even the homepage works).
The web console wizardry would be this - you just need to add the embedded vimeo link to a frame on the chosen patreon page. By doing so, the video actually plays. Then you can try and download it. Vimeo uses split m3u8 streaming protocol so it's a pain in the ass to download - but, with this method, at least we can watch it.
For my example, I will watch the embedded private vimeo video on the following kemono post:
You must be registered for see links
Internal pelvic health assessment
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You must be registered for see links
The vimeo link given is https://player(.)vimeo.com/video/459774939. Of course, we can't play the video by clicking on it. But, following stinkerray instructions, if we use his string:
<iframe src="https://player(.)vimeo.com/video/#########?h=d184893c77" width="640" height="564" frameborder="0" allow="autoplay; fullscreen" allowfullscreen></iframe>
And replay the hashes with the video id (459774939) and remove the parenthesis, now we only need to add it to the source of a live patreon page to be able to watch the video.
Just as an example, I will use this patreon page, a post by susieg:
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After opening the page, I open the "elements" tab in Chrome's web console (by pressing f12 on Windows), I right click the <html> line (the second line in the console), select the option "Edit as HTML", select all that is written inside it, and replace with our string (don't forget to remove the parenthesis!):
<iframe src="https://player(.)vimeo.com/video/459774939?h=d184893c77" width="640" height="564" frameborder="0" allow="autoplay; fullscreen" allowfullscreen></iframe>
After that, I just click outside of the edit box and close the console. Voilà, the Vimeo video will load, and you can watch it!
P.s.: Tried download the video but my trustworthy method isn't working. FetchV also isn't locating the source. When/if I subscribe, I'll update the kemono and make a post here with the embedded links and hope that a soul with ytd-dlp knowledge help us out (I'm on an older machine that doesn't run it, due to the older OS not supporting the Python version required). If all else fails, I'll boot a Linux distro, try to run yt-dlp and download it myself.
Here are, at least, the thumbs for the video in this example:
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If you find it worth it, follow the procedures to watch it yourself.