LOTW complimentary curriculum

Any suggestions on curriculum I can use along side LOTW? I’m thinking maybe something like science experiments for pre k?

Also has anyone ever spread LOTW out twice as long? 1 letter for every 2 weeks with other curriculum mixed in?

We are doing K4, but adding in Usborne books to add in some fun science, geography, art, and more!

Are you thinking one week for letter recognition and one week for letter sound? I would think the child might get bored with 1 letter for two weeks. Maybe try one round (26 weeks) for introductory and a second round (another 26 weeks) for mastery if you think your child needs it?