pretty sure none of the town centre outdoor shops sell or hire. The only places i know that rent are;

Sport trend shop - Hinwil - out of town but not far and on the way to the mountains pretty much. Has a crap website which i can't remember. Only use 7tm bindings on regular downhil gear.

Marty Sports - on the main street of the last village before Hoch - Y - Brig, you drive past it before getting to the lifts. Is the kind of shop which has stuff dating back to the ark but the guy is a real tele enthusiast so last i looked the gear was okay.

Flims - at the resort, has a glacier for early season skiing too.

Fullmoons - Davos, pretty good kit, nice guys
Engleberg - can't remember the name of the shop but it's fairly obvious and Engleberg is a little honeypot for tele skiers. has a glacier too for early season skiing.

There must be somewhere in the Toggenburg but don't know details.

and finally I have my old Scarpa T2s size 23/23.5 and some BD Arc Angels (170cm) with G3 bindings -on the off chance that these would work for you.

Enjoy