I wonder why we don't think of BPs, rather than BRs, a 200 BP would be more inclusive.
Presumably the main reason for offering a 200 BP would be to allow more relaxed speed limits, but this would require keeping the finish open much later, or starting much earlier, so I can't see many organisers being too interested in that.
It might work if you're running it concurrently with a longer event, as is the case with Black Sheep's 'This Is Not A Tour' events next year, which include a 300 BP and a 400 BP.