rsl12 I am not sure if I get it...
Let's say we do in month 1, 4, 7, 10 but two different pieces each month, we have 8 in total.
But what's the advantage over 1, 3, 4, 6, 7, 9, 10, 12 (every month except the quarterly)?
But if we do 3 times per year (and then 2 different pieces per months = 6 total), we end up with 1 month overlapping with the quarterly. If we want to avoid that overlap, we have a very irregular schedule again.