My understanding from French friends (but French TMers may disagree) is that an imported vehicle requires an Attestation d'Identification certifying that it complies with French technical standards. If the M3W is three years old, MMC should provide this through one of its French dealers. It is possible that you could get it from the local prefecture because they can access model records.
Post-Jan 2017 (when the EU Regulation came in) EU4 models modified to look like an EU3 (even if emissions still meet EU4 standards) may have to be inspected and you will have to produce a compliance certificate from MMC.
So - a three year old EU3 import can (I believe) be imported to and driven in the EU without problems, although long term residence will necessitate registering it with a new plate. A new one, if validly built as an EU3, is also fine - but I have some doubts about the compliance of new EU3s with EU regulatory requirements.
Please correct me if i have been misinformed.
Last edited by M3W55; 12/12/18 09:38 AM.