Oj - also, re: Dimensions, I suspect the curriculum maps pretty closely to the other Singapore Math products, one of which is tied to Common Core. If video instruction is a key part of the value for you, I suspect you can get away with using the CC edition and still carve out that expected time for your own work.
PS. If ever you'd like to PM me, this past year has been much what you describe - DS enrolled virtually in his usual brick and mortar school with me working and co-teaching. We're previous full-time homeschoolers, as well.
