I would think that your steering quick release was a Lifeline one Richard, they are better made than the later Traven items. Personally I would disable all steering wheel QR's but certainly the Traven ones fitted after April 2017. They have proven to be dangerous and have caused some accidents when the steering wheel unexpectedly comes off!!! All owners should read the article in this link:

https://www.mtwc.co.uk/wp-content/uploads/2019/10/QR-Steering-Wheel-Problems.pdf

As for the gap at the base of the screen, put a bead of clear silicone sealant in it. Sorting the restrictive exhaust is one of the best improvements for a M3W. The "bafflectomy" works well but can be very loud and there are more noise restrictions on their way.

Enjoy your M3W, I remember seeing it at a show once, very tidy.