Sounds like a plan to me.
I will be "tossing" out a number of flower seeds this fall. Papaver somniferum, hollyhocks, clarkia.
I figure if they come up too thick I can always thin them. I had great luck with fall sowing last year, of course most things came up the following spring.
I have found that here in zone 9, they come up when they want to even a full year later. The weather here is moderate and sometimes a bit confusing to annuals.
Are you putting in the tall phlox? I'd like to try that one this year too.
Pic of fall sown Poppies and Lineria.