Mamochka5,
You caught me as we're wrapping up the new book, which is always our busiest season! So, I'm just popping in and out on the board right now.

Normally, you'd have had a response from me awhile ago, so I appreciate your patience.
The ladies are doing a fantastic job of helping you sort through your options and find the right fit for YOUR family. At HOD, it does take time to find the fit that will be right for each unique family, as we are not a one-size fits all company. However, you'll find that finding the right HOD placement is time well-spent as it gives you a more customized education for your kiddo's specific needs and actually makes you look at each child as an individual to see what the needs for that particular child may be.
I have a few scenarios swirling around in my head, after reading through the thoughts you've shared with the ladies.
Option 1: Place the 5 and 7 year olds in LHFHG (and add the right side of Beyond for spelling, hands-on math lessons 1A/1B, copywork from poetry in Appendix of Beyond, the language arts lessons once weekly, and the Emerging Reader's Schedule in the Appendix for your 7 year old). In this option , you would do CTC for the oldest.
Option 2: Combine the 5 and 7 year olds in Beyond, doing it on a 4-day plan (thus stretching it 9 weeks into the following school year to allow your 5 year old to grow into the program better). In this scenario, you would need to add a phonics program for your 5 year old, a handwriting workbook like A Reason For Writing, Kindergarten math, and possibly the Rod and Staff workbooks. You could do this easily by adding those parts from the right side of LHFHG, or you could do these options without the LHFHG guide if desired (but then you wouldn't have the hands-on math lessons in LHFHG) In this option, your oldest would do CTC.
Of the options swirling in my head, these are my top two choices. I have a somewhat similar age spread at my house (having a 13 year old, 10 year old, almost 7 year old, and a 3 year old). The spread in abilities simply due to age and maturity is large between what a 7 year old can do and what a 10 year can do. We will be doing CTC with my 10 year old this upcoming year and Beyond with my almost 7 year old. My 3 year old will begin LHTH (slowly), and my oldest will pilot a portion of our new program. So, I can empathize with your situation.

I do enjoy my school days with my kiddos thoroughly and find it very manageable to run more than one HOD program. We've been doing two or more for years now. Only you can know what will suit your family best though! I pray the Lord will give you the peace that you're seeking with whatever your decision may be!
I also wanted to mention that the HOD guides from Preparing Hearts on up switch to craft-type projects and do include baking, simple feasts etc. So it's not that we don't do that type of thing at HOD, but rather we wait to schedule it in our guides until the child is at an age where he/she can truly do the projects for himself/herself and follow the directions to carry it out (rather than having the parent be in charge of it all)!
Here's a link to a past thread describing some of the projects within Preparing Hearts:
viewtopic.php?f=31&t=1715
Blessings,
Carrie