The 2 new strips finally surfaced online, though Miyuki was not involved. The magazine did feature character introductions which included a page for her however. So far this is the best shot I can find. In hopefully better news, an unexpected new spinoff by Hongo Haruki with a 31 year old Konata is planned to be published in December.
https://en.datosjam.net.pe/manga/lucky-star-will-have-a-spin-off-with-an-adult-konata-izumi/>the author Kagami Yoshimizu commented: "I’m looking forward to seeing how it will be. The design of the story and the way it was put together was a great example of how I was able to capture the characteristics of the characters while also highlighting Hongou-sensei’s amazing abilities."I feel like the art style leaves a bit to be desired, but maybe a potential Miyuki appearance will be satisfying and sway me in its favor.