Yep,

A colleague of mine is currently running ICS on I9100G.

The ICS package was obtained from some non-official source below :
http://androidadvices.com/update-galaxy-s2-gt-i9100g-official-ics-403-xxlpq-firmware/2/

With the help of Odin3 software running on a PC, the task was quite easily done.

The only thing to be wary about is to distinguish between an ICS bundle packaged for I9100G & that one meant for I9100.


 Tony.