You can qualify with 4 x 600 if you like.
*You* can qualify with 4 x 600 if you like.
I'm sure some hard-core Audaxers have done this, but being hard-core, they probably wouldn't even bother mentioning it.
If it was me, I'd be shouting from the roof-tops, and expect an entire edition of Arrivee to be dedicated to my incredible endeavour!
As for qualifiers, I'm unsure about PBP, but I've booked the Flatlands, just in case I get decisive and find everything is full!
Looking at the calendar, I quite fancy something completely different in an area od the country I have cycled very little....like Tour of the Borders. We'll see.