I agree with your ranking, that series ended me with a smile on my face for at least a week.
The 2 special episodes are like the series, cute and sweet. The movie is good but I remember that I appreciate a lot the movie because I was already in love with Kurosawa and Adachi. As a stand alone, it would have been less wholesome. No big drama.
For the Thai adaptation, it's going to be an adaptation of the manga, not a remake of the series. I read the manga, volume 09 is schedule here in Canada in december (I hate that longing...). While the series is quite loyal to the manga, some characteristic are a lot different (Adachi and Kurosawa psychology, the very weak presence of Tsuge and Minato...) so I will not make a comparison between the two version.
Thank you for the recommendations! I hadn't considered BL anime but I have watched some... I avoided Given since it looked too sad for me lol. It could be something for the future though! The BLs you mentioned are ones I keep forgetting about so thank you, I'll make sure to check them out soon :)