Well, I was wrong in my theory about these possibly being Nepytia phantasmaria or Phantom Hemlock Looper eggs, so my next steps will be to review all my moth photos from early September to try and thread out any other possibilities. That may take some time. Initial observation (date eggs laid) was Sept. 12, 2021. Today is Oct. 7, 2021. They are indeed pretty tiny and if you look closely, you can see the caterpillar body rolled up in the eggs that haven’t hatched. The tree is a Caucasian Fir (Abies nordmanniana).
Thanks for reading! Stay tuned for further updates. I’ll do my best to figure out an ID for these. 🙂