88key Filco Majestouch2 Ninja in some European layout (thus ISO), but I haven't seen one with MX Black in a while.
I think CM Storm is discontinuing keyboards with blacks.
It's the one I've seen that gets closest, for sure. But the lack of Blacks is sort of a dealbreaker. I think you're right about CM Storm, but they're not selling the Quickfire Rapid in Europe anyway, because Filco have patented the front printed letters used on it.
You could get one from WASDKeyboard, but it wouldn't be TKL. They allow you to customize each keycap, so a blank set would be included (technically) with with keyboard.
TKL is important to me, but I might order the blank keycaps from there :-) had some cool keycaps made there.
So the cheapest way to get new blank caps is probably to order from a GB such as Ivan's R2. Otherwise you can see if anyone is selling used blank caps in the Classifieds here or on DeskThority (they're more EU-centric).
If the QFR Stealth was available in Europe, that would be the best way to meet all your requirements. However Cooler Master cannot sell their Stealth in the EU. You could see if they make an ISO version of the QFR Stealth and then proxy it.
Edit: You can also try ordering from TaoBao but I don't know how to order from them nor do I know the shipping prices from China to where you are. There are apparently buyers and websites you can use but I don't trust them.
Good idea, I can ask around a bit. And yes, I really like the Stealth (it's pretty much a cheaper, better looking Majestouch-2 Ninja), but sadly it isn't an option because of the patent thing. I can look around a bit, but I would be surprised if they manufacture any ISO boards for outside Europe. Also I don't think they do blacks?
So I'm actually still looking... Can't even seem to find one with all but the printed caps requirement :-(