Simki works well for series that are logically ordered into seasons, but not for episode which are disjoint. I'm watching episodes of the NHK documentary series Begin Japanology:
https://simkl.com/tv/20325/begin-japanology/episodes/

I would like to be able to easily mark some episodes watched, but I haven't watched them in any particular order.

Currently I can mark episodes by season, but without labels, which is useless since episode number has no meaning. If I go to the episode page, I have to individually click into an episode to mark it as viewed, which is horrifically inconvenient.

What I need is an option to display the episode page as a list instead, with a convenient way to mark any particular episode as watched.