I may have found a better (for me) option:

http://www.wihatools.com/700seri/757serie.htm

I didn't know that 4mm micro drive bits even existed. Technically these should fit perfectly in my Cybertool. I guess you really need to choose your words carefully when searching google. Once I stopped looking for multiplier bits, all sorts of things came up.

These particular ones only go down to T-3 Torx but if these are available, there will be others...the hunt begins!