I doubt you will find another ebike with Rohloff and a belt.
The Raleigh Centros has a Nexus hub gear and a belt, in decent trekking spec.
What do you mean by long distance?
The Centros has the benefit of the more economical Bosch motor, bur carrying a spare power tube battery would be marginally harder than carrying a standard down tube spare.
The Supercharger with a single battery would be a waste of space with a realistic range of 40/45miles.
My view is for distance you would need a twin battery or spare battery, whatever model you choose.
The Raleigh Centros Tour is packed with technology for the premium electric bike experience featuring Bosch Active Line motor, 500wh battery and controls.
www.raleigh.co.uk