Good morning, Starla!

I may have said this already in the post you mentioned, but you could do LHFHG, Beyond, and Bigger Hearts all just 4 days a week, and start any of them half-speed you wanted to, stretching these 3 guides nicely over 4 years.

Each guide is about 35 weeks long, 5 days a week, resulting in 175 days of plans each year. If you did all 3 guides 4 days a week for 35 weeks instead, you would get through 140 days of plans each year. So, you could do all of them 4 days a week AND have some wiggle room to do the starts of the guides half-speed. This would have you on a nice plan to match your older child doing PHFHG.
To do the math, and to be exact, the wiggle room would be...
525 days of plans for 3 guides (35 weeks x 5 days x 3 guides)
140 x 3 = 420 days of plans taught in 3 years, doing school 35 weeks, 4 days a week for 3 years
105 days of plans to finish the last guide in the 4th year
35 days of wiggle room to go half-speed whenever you want
I am so hoping I am not being confusing here, but I personally LOVE this plan and am planning on using it myself with my little guy! I enjoy having all of the dc on the 4 day a week schedule. I'd not advise doing any guide other than LHTH half-speed for 2 entire years. It gets too long, IMO, and if a child truly needs to go half-speed in a guide for 2 entire years, he/she probably should have been placed in the guide below that guide instead. I hope something here helps as you consider what you'd like to do for your dd!

FWIW, two of my three dc have definitely always taken to reading well before taking to writing. They still learned to write well - just later! I agree with you, no need to hold back the reading due to the writing. HTH!
In Christ,
Julie