My belt failed

No, above I’m referring to belt drive (kits) only.

ATS:
https://bikegang.ecwid.com/Strida-ATS-Speed-Drive-Crankset-Upgrade-Kit-Heel-kick-shift-2-speed-ATS-p49717138

efneo GTRO:
https://www.efneo.com/shop/gtro-for-folding/

Both kits include a belt, a 80 t beltwheel and the excenter.
The ATS has to be shifted by heel and the efneo by wire.