Probably a bit late, but I really like Quod Libet. It is very extensible, runs light, has excellent tagging and filtering, and just feels similar enough to how I set up my foobar2000.
I have always loved FB2K, but I didn't like using it in linux. It was slow to start (which is snap's fault) and was tough to get working in a stable state once I started trying to use components that I prefer (probably wine's fault, but who knows).
I'm in this exact situation now and have been for many years, while previously in a gigantic company..
Pros:
You (hopefully) tend to have significantly more influence on the tech stack and software direction.
You're (hopefully) treated like a real person and not a cog in the corporate machine.
You (hopefully) get to learn and do a larger variety of things.
Cons:
Pay can be lower, and getting raises can be harder when you're talking directly to the CEO/Owner and it is quite literally coming out of his or her pocket.
Taking leave tends to be harder when there is so few people to pick up the slack.
I currently have three monitors + a laptop, but its actually two separate workstations with two monitors each. I used to have a few more, but I definitely didn't get that much benefit from 3+ per workstation. My main benefit was being able to keep chats, email, and music player readily available/visible while still having two full screens for work.
12 hours isn't really even that long, could probably bring just about anything, but I think Sid Meier's Alpha Centauri would be a great way to spend that time.
There are so many mitsumis and it shouldn't surprise me that I don't know them all (they seriously are all over the place). I am now in the midwest, so we probably won't run into each other.
Sorry, didn't see this reply until now. I don't know all of them for sure (especially the few that look like really old Cherry like the MY and M9?), but own or have owned a quite a few of these. I parted with a bunch of my collection when I moved states last year, but still have several old boards that have SKCM Alps, vintage Cherry MX, and my clicky space invaders and some not pictured like my SMK Cherry MX mount and a few Model F and Model M.
The XM clones aren't even Gateron quality IMO. I did end up with three fullsize XM boards when a site was selling them for $5 a piece. They were definitely worth that much.
As someone that owned all three, the NES without question. If you have budget or desire for a second pick, my recommendation would be to try and find a Sega Game Gear and pick up an adapter for playing Master System games.
I don't know of any other full sized EC keyboards that support wireless, but depending on if they meet your needs, I know that Varmilo makes selfcontained EC switches that are hotswap compatible with Cherry MX switches. They aren't going to feel just like a Topre dome used in a Realforce since they are quite different in construction, but they are electro-capactive. If you don't need a full sized keyboard, you may have more options via Topre clones like some of the NiZ/Plum/Royal Kludge keyboards.
Probably a bit late, but I really like Quod Libet. It is very extensible, runs light, has excellent tagging and filtering, and just feels similar enough to how I set up my foobar2000.