I'm afraid you are going to have to be more patient airfoilmod. Given that this is the only known incidence of this phenomena occurring in service I think the odds are on your side next time you fly. Temporary measures have been taken to minimise the chances of a repetition.
Unfortunately it's just not as simple as saying it must be the fuel or it must be the Trent. It could be both. The fuel clearly is introducing the contaminant (water) into the system. The question is why does it form ice accretions? Do these form only because of the fluid dynamics in the Trent system? Do they form elsewhere in the 777 fuel system and only become trapped in the Trent because of it's design? Could this occur in other designs? Are there geometries which encourage ice accretion which are not specific to the Trent? At the moment all they can confirm is that in a certain part of the Trent ice can accrete under certain conditions, but given that nobody has tested any other engines like this nobody can say for sure whether other engines could be affected.
This is fairly blue-sky research and throwing money at it doesn't necessarily give you an answer any quicker. If it did we'd all be using our fusion reactors to power plants manufacturing an HIV vaccine.