Numpad

[el_murdoque]

Hi,
I'm currently looking for a useful Numpad. In my Office, I often type longer colums of numbers, and I'd like to do that one handed. On my Preonic (ortholinear) keyboard, I have the Num block mapped into a layer which requires holding down one key with the left hand. That's impractical because I usually use my left hand for other things than that. So a separate numpad would be handy.
Here's what I'm looking for:
1. Mechanical keys.
2.Available in Europe right now
3. Not too big (as few extra keys as possible. I'd also take an ortholinear 4x4 that is fully configurable) 
4. (optional) wireless would be dandy.


Any ideas?


 

[suicidal_orange]

Why not just add another lockable layer on the Preonic?

[pabile]

is diy an option? this might be of use https://www.thingiverse.com/thing:4333236
most of the files you need to build it are in there. use bluefruit LE instead of promicro for wireless connectivity.