I just found a new site that offers literature based packages with a 4-day per week yearly plan. It looks nice, they use HWOT, MUS, Singapore, Usborne. I think they publish their own science and history. I couldn't tell but I didn't look very hard.
Book Shark.
https://www.bookshark.com/
ETA it looks like they use Real Science 4 Kids and SOTW, also. RS4K is what I'm trying next fall.
I've read a few reviews and Book Shark is called the secular Sonlight. I think they might have the same parent company but I'm not sure.
Here's a review
https://www.notsoformulaic.com/books...e-gifted-kids/