I’ve tried a lot of key managers in the last few years.
The one I keep coming back to is a Fura model I bought from China for less than three bucks including shipping.

It’s this one.

The craftsmanship on this particular unit is spectacular for what I paid, but sub par for what I’d like.
I use 4 standard Keys plus a USB key which is a little thicker than a standard key on mine.
This concept is, hands down the best solution for my particular needs.
Does anyone here know of someone that does these things in a higher quality?
I’d strongly prefer a fancy metal (titanium or copper) over ‘Aircraft-grade Aluminium’.
Must ship worldwide – or at least to the EU.