http://www.keyboardco.com/ sells the Filco Convertible 2 [0] and a few other Filco keyboards - they also ship internationally. Bought from them before, would definitely do it again.
That's a great store, but they were out of stock, and nobody selling them on Amazon would ship to the Netherlands. Maybe they're easier to find in Japan, where they're made. I made sure to lock in my order from Australia where they had one in stock, before blabbing about it on Hacker News. ;)
It seems so sensible, I don't understand why there aren't more convertible keyboards like that! Together with a convertible bluetooth mouse like the Razer Orochi that also supports multiple bluetooth pairings, it's the best of both worlds for low latency USB gaming, charging, and wireless switching like a KVM between Macs, PCs, tablets, phones, GearVR, etc.
Be careful shopping for convertible devices that actually use Bluetooth and not some proprietary dongle, and that actually use USB for fast low latency data instead of just charging!
It seems so sensible, I don't understand why there aren't more convertible keyboards like that! Together with a convertible bluetooth mouse like the Razer Orochi that also supports multiple bluetooth pairings, it's the best of both worlds for low latency USB gaming, charging, and wireless switching like a KVM between Macs, PCs, tablets, phones, GearVR, etc.
I wish there were more convertible devices like that to choose from. The KBTalKing Pro looked wonderful, but never made it to regular production ("factory issues"). http://kbtalkingusa.com/ http://www.keyboardlover.com/kbtalking_review.php
Be careful shopping for convertible devices that actually use Bluetooth and not some proprietary dongle, and that actually use USB for fast low latency data instead of just charging!