I have a 52cm 2018 Haibike sDuro Trekking 7.0 with a pathetic 800 miles on the clock. It’s great but I’m selling it because I don’t use it.
Maybe that could work for you -depending on geography...
Oh.. this just adds to my confusion.. The current trekking 7 is not a Sduro model, but a little googling found the spec on the Sduro trekking 7.0. That's quite a lot of bike with some choice components. If I'm right though, the small front chain ring with an internal gearbox adds to the drag when not assisted, so whilst never having ridden one, I decided against any small chain ringed bikes.. Looking through the Haibikes current website, almost all have a more normal sized 38 teeth chainring, expect the Sduro Hardseven 4.0 that has a front shifter for a 20 speed drivetrain.
Whilst your post is not technically a for sale advert, rather more of a suggestion, what sort of price would you have in mind?
I may have to bash my head against a wall for a bit before I can get to sleep...