Someone should make a hard polymer mold kit to create your own custom drivers on the end of a Torx tip. This would be able to adapt to any screw companies could devise, and would probably be safer from stripping the screws than improvised drivers. It would also keep repair people from asking questions about changed screws. Most importantly, it would defeat companies' attempts to keep us out of our own property. These tips wouldn't be as durable, obviously, but the typical user only needs this sort of things a few times a year.
I'll try it, but I suspect that there won't be enough strength in the plastic. Torx are designed to be set with a lot more torque than "normal" screws, hence the name.
Sugru wouldn't set hard enough, and you'd have to leave it in place overnight anyway. I'd go for Polymorph (called Shapelock in the US), which sets rigid in a couple of minutes.
How mushy is Sugru? Maybe a syringe and a tube, along with a hollow needle to defeat air bubbles. That plastic goop for fixing headlights that hardens under ultraviolet seems a likely candidate. You'd just want to make sure none of that seeped in past the screw.
I've done exactly this to moderate effect with "greenstuff" modeling epoxy. I use it in my other hobbies and had it on hand. It lacks the strength to really break multiple seals from some of the loctite's used in apple products.
(related: http://www.amazon.com/Games-Workshop-Green-Stuff-Modelling/d...)
Usually a tough Allen wrench of similar size and some luck works on those oddball sized heads.
