I am so excited to find this board of HoD users! I have two sons, ages 5.5 and 4, and a daughter who is 1. We will be starting our first year of homeschool with K in the fall.
I have many questions but for now will just ask one for the sake of time; I have a t-ball to get to in an hour!

I initially wanted to piece together a curriculum until I found HoD. I am thrilled with the things that HoD offers, but am sad at the thought of letting some other options go.
For example, I wanted to do Mystery of History and Apologia Astronomy. They both seem like excellent resources for my eager learners. However, if I do these in place of History for Little Pilgrims and one of the HoD science choices, will it completely unravel the LHFHG guide? I've read that all of the stuff for LHFHG intertwines beautifully together and really don't want to undo that, even if those are great curricula.
For those of you who've used these things or who have already done LHFHG, can I supplement with those things as needed, or would it be introducing things in an odd way or reviewing things too much, essentially making our day longer and my job harder? Also, are these things that can be introduced at an older age?
I would greatly appreciate any feedback on this topic!
Thanks in advance!