FWIW, these fit Gen4's
https://www.ebay.co.uk/itm/BMW-S100...730890?hash=item4b86a8684a:g:bP8AAOSwD9hft5Nr
Baz caught his brake lever on another rider (who was going slowly) as they drifted across the track taking the line that he was on (he was on the outside of them as they were approaching a right hander). It was a bad call to go round the outside at that point on the track, I'm sure he thought he had time, he rode at a very high level, but, the result was he was catapulted off and died on impact. A brake lever guard could have stopped the minor misjudgement from being fatal.
Thanks for taking the time to explain, and I'm very sorry to hear what happened to Baz. However, I am deadset against this move. I have no problem with whatever safety rules are introduced for racing, but the ethos of trackdays is to be able to take your road legal bike and ride it safely on a track without requiring any modifications. I feel they would do better to encourage/enforce safe riding instead of encouraging close contact, but don't worry at least your brake lever will still work.
I will boycott all future MSVT trackdays if they insist on this rule, and happily support the other trackday providers instead.