To add to MattW's previous posts, coming from the TC side...
You don't
have to submit new boots to be scrutineered. Plenty of TC guys submit old sets for a weekend. As long as they have the correct mark for the meeting (on the outside of the wheel, for ease of looking at, along with the BRCA number), it's fine!
For example, I've got a set of wet tyres that have been used once, and now have marks on them from 7 nationals (will be 8 next weekend)... thats well over a year now!
Effectively, any previous event marks are ignored... if you want to save the allocation for new sets only, feel free (and in all honesty, in TC most do go new), if you want to use old (due to finance, track conditions etc), then thats groovey too
In terms of scrutineering, there's also no requirement to have all the sets marked up at the start of the day... just the one your going to use for your first run. If you want to run more, then mark them up as needed... as long as the car goes through scrutineering with a mark on the wheel, no problem.
I will be honest, and will say that the system used does require usually an extra person to help out in terms of marking sets, but where there's a will, there's a way.. right?
I'd certainly agree a pre-mount would most likely not be the right way to go, it's not like TC with a 12mm hex on every single car on the market, lol... but a simple limiting of the sets per meeting, surely can only help to sustain the popularity of the nationals? and mean more ££ for beer... and who doens't like that?
Ed