As I understand it, your meter and strips need to be rated for alternative site testing. At least in the US. But even then , you should only use those sites when BG is expected to be steady, and not for insulin dosing.
The Freestyle Lite I use is rated for alternate site testing, and I take fasting on my palm or forearm; I never feel it in either spot.
edited to add: I think the Libre is all about your location and health scheme there. Im in the U.S., I left a voice message asking my doctor to prescribe it, and picked it up at the drugstore the same day. Others say their doctor refused them.