I don’t know why this didn’t occur to me until just now, but I finally realized that I can kludge having monthly archive pages by tagging things with, e.g. #June2019, #May2019, etc.
Good call! One thing I found useful is wrapping those tags in a span and putting
display:none in the custom CSS. This helps hide those kind of ‘business logic’ tags that would otherwise ruin the flow of your posts.