Interesting! This should definitely help with tracking down a suitable case for it, so thank you again!  It is not an urgent matter though, as I intend to use the Hermes strictly at home along with the Erika Daro 41. I am hoping to clean up my Triumph Tippa, or possibly this very nice looking Tippa S somebody is selling for a song, to use outside of home.

Noticed that some of my cleaning efforts actually caused the keys at the extreme right side to get sticky. Some of the gunk probably moved deeper in there and resolidified. I got some proper tools now though to try to clean the segment properly.

Was also delighted to learn that removing the carriage in these is not that complicated, so even I should manage it.

While I was a bit nervous about taking off the carriage, I'm happy to report that it was a rather simple task, and I was able to do some proper cleaning inside. Now the keys aren't sticky anymore either. While placing the carriage back there was a small "uh oh" moment, when I didn't seem to get it to drop in place properly, but after a few tries I managed to get it back in place without breaking anything.

I also saw that the right-side carriage button is not actually broken per se, but has just somehow come out of it's proper place. I could see from the left side how it's actually supposed to be in there, and tried inserting it back into it's slots, but to no avail. Not sure how it even managed to pop out in the first place.
It seems I would have to open the right side of the carriage in order to fix it, but I'm not quite sure how to do that, so for now I will be satisfied with using the one working carriage button. Luckily this does not affect setting the right side margin, even though one video gave me that kind of an impression.

Next I'll be looking at this Adler Tippa S I "rescued" from somebody's attic, but perhaps I'll create a separate topic for that.