I experimented in circling the rectangle - though only went halfway around so I could see if the yarn over and increase coming back would work. It looked ok. But I think it needs more color. I like the look of keeping the stitches live; it feels more knit, binding off and picking up the stitches gives a greater stiffness. Plus the back is looking cleaner and cleaner as I go on, mostly from getting better at picking up the stitches - but it does lend to a feeling of progress.
Also I'm using mostly stash yarn - left over from other afghans - which is hiding evidence that a bag of yarn apparently went missing when I bought some of it, or that I overbought in response to running out and not being able to go out to fetch more immediately. (If you've never had to stay home, then I don't think this will register.)
On another note, I went to Goodwill. I had the thought the other night about virgin wool, and googled recycling yarn. A variety of interesting blogs popped up where people had gone to a thift shop, found a promising sweater and then ripped it apart for the yarn. Which seemed like an interesting idea, and added to the suggestions in other places that it might be a decent place to find needles and yarn... I went. And have come to the conclusion that the people who found silk blends, and other nice non-polymer knits were in bigger and wealthier areas. Only found one silk/cotton some nylon blend - no wool - and that had a huge multcolored motif on the lower front corner - not enough yarn, or good enough to attempt to dissect it.
And they were right about one thing - it breaks your heart to see the granny square blankets in near pristine condition. Perhaps I can think that maybe someone spent all those hours and intentionally donated some of them - I hope so. And perhaps it is a good thing, that family members donated the old 70s yarn colors afghans that were there too, at least they weren't tossed.
