Whilst on the way back from the Jungfrau-Treffen two of us were stopped by German customs for a "Random Check". They specifically wanted to check our driving licences and looked up on their database to confirm we were OK to drive. They were happy we had licences for type A vehicle and we were on our way.
As a reminder, to drive your M3W in Europe the MTWC understanding is that unless you were licenced to drive a Three-Wheeler before the 19th January 2013 then you need to be over 21 and either have passed your UK car driving test before 19th January 2013 or hold a full, Class A motorcycle licence.
.https://www.mtwc.co.uk/2022/05/changes-to-driving-licence-warning/
Note for UK residents driving in the UK you simply need to have your car driving licence and be over 21
