Deanna,
Thanks for sharing a bit more about your situation!

It is so helpful! In planning the best placement for your little one, I would honestly finish LHTH and evaluate where your child is at then. If he is ready for LHFHG at either half-speed or full-speed, I would move into LHFHG. Otherwise, it will seem like you are "buying time" when he is prepared to go forward.

Most kiddos who are 5, who have completed LHTH, are ready for LHFHG.

So, I would be thinking your son would be ready.
You can start LHFHG easily at half-speed, doing the left side of the plans one day and the right side the next. You can continue this all year, if it is a good fit. Or, at some point during the year, you could bump up to full-speed if he seems ready.

Once you get to the end of that first year of LHFHG, you can evaluate again and see what the best plan is for the next year. Typically, kiddos who have done half-speed for part of a year, up to a year, are ready the next year for full-speed to finish out the guide. Rarely, do families do half-speed of a younger guide for two full years.

This is because little ones are growing, gaining, developing, maturing, and changing by leaps and bounds. So, what seemed like too much at the beginning, can quickly become "just right" as you journey.
Hope this helps!
Blessings,
Carrie