It's probably not the time of year to check it on the road in Switzerland but did you resolve the idle issue in the end Laurens?
The project is on hold due to the snowy weather in Switzerland. And also as we’re on holiday and driving the Mea Hong Son loop in Northern Thailand with the motorbikes This is absolutely the most amazing road on the planet. Would be fantastic to do it in a M3W as well. For the ones interested search on internet for Mae Hong Son loop Thailand