I had this idea of schedule sex for some weeks and thought it could solve our problem which was very similar to yours and lasted for many years.
We had a week-end trip planned, in a good hotel and a very fine restaurant. It was a joyous meal and after something like an hour I presented her the idea of a once a week romantic and sexual rendez-vous at home, fixed day, fixed time, at a moment we don't work and kids are at school, with the house's door locked and the key in the lock.
I exlained how I thought it could solve our "almost dead bedroom" problem which was related to not ever being in the mood, difficulty to communicate about sex, procrastination, rejection after initiating leading to waiting for the other to initiate, etc.
I underlined all the advantages for her : -no risk of kids coming or hearing us -her always clean and emotionally prepared -me always clean and emotionally prepared -only once a week but intense and passionate -no pressure or worry rest of the week -no need to talk or akward initiating.
She agreed to try it for one month and to decide after that if we go on, adjust or stop. Importantly, we also agreed on a backup schedule, i.e. another time of the day to use when it's really not possible as scheduled (kids not at school etc.), even if less ideal and maybe requiring a shorter and simpler activity.
At the same time, I made another change and went full alpha during sex, i.e. I almost always have a plan and guide her verbally and nonverbally during sex which she enjoys a lot (but she never told me before).
And it all went very well

After some months, procrastination tried a comeback and she started trying to "dodge" it for bad reasons, we had another difficult conversation (discussed in another thread) but then it was all good.
It was two years ago and we still do it as originally planned, and we are happier than ever before !! She's also a lot more sexually open and horny now, physically and mentally, on our schedule but also more generally, and has no more problems reaching O.
In short, schedule sex frees us from many things and allows us to get emotionally and physically ready, also anticipation makes us very horny.
Give it a try, best of luck !