The big sky principle applies. Yes you can NOTAM - no you can not ensure that it will be read.
I've been in the "box" competing and doing well and come close to a glider at Fenland and an Agusta 109 at the NAtionals at Peterboro'. Yes I saw them and the latter was called to me as I saw it. It is still my responsibility to avoid and that comes as a higher priority than than winning.
The judging line do a really good job - they judge they help out with infringement sightings but ultimately it's the bloke in the cockpit who has to look out.
I think the OP is slightly over the top and possibly under the weather.
I do recall a gaggle of microlights bursting the box at the Nationals five years ago and myself getting a little worked up - but only because it disadvantaged me and improved someone else's score
