Import/export of a Stromer (Switzerland)
Does this make sense and if so, what do I need to bear in mind?
The stromerforum.ch user 'beamster' answers this question here:
Upon importation, the form Test report 13.20 A (CHF 90.-) can be obtained. This can be used to present the Stromer at the relevant road traffic office (STVA). The numbers will be compared (CHF 80.-) and after a few days you will receive the vehicle registration document (subject to a further CHF 70.-)
the user 'Frugalist' here:
I also bought my Stromer ST7 in Germany. Properly exported and cleared through customs (QuickZoll app). At the STVA (road traffic office), they wanted the original COC document and the customs receipt to register for the vehicle inspection (because it was imported). The STVA creates the form Test report 13.20 A during the "demonstration", where everything is simply looked at and compared. It doesn't take much effort and after the vehicle inspection I immediately received the vehicle registration document and a license plate.

Summary:
Import into CH: The CH needs the Test report, the individual form 13.20 A. so that the Stromer can be registered. This is issued by the STVA (Road Traffic Office) when the vehicle is presented. The original CoC (Certificate of Conformity) of the imported Stromer and a customs receipt are also required.
Export from CH: The CoC itself would not be a problem, as it is supplied for all bikes sold in the EU. However, Stromer does not offer this for Stromer bikes sold in Switzerland, or does not issue it. And no export to the EU without a CoC. In Switzerland, the vehicle registration document is issued instead of the CoC.