Official service manual shows Piaggio techs using these L shaped Torx wrenches in a lot of the photos.
The 'screwdriver' supplied in the scooter tool kit has two of the sizes - but is pretty much useless on the very tight factory-shot Torx fasteners. I needed some Torx bits in a impact gun to break loose things like the foot peg screws. But in tight panel areas these L shaped tools are best.

These are plenty long enough to get good leverage.
Several sellers on ebay offer these sets, for @$12-$15. Some of the black metal sets are made in USA.
Seems to be good quality and were shipped in just a few days.

I tossed the set under the seat...