@Alex you may want to break this into a new thread?
Good to hear from you Abrams. I had read your post a few days ago about your struggles and thought it would be good to get some input from you.
I have worked with a functional medicine physician about this issue, but unfortunately after 2 visits she left the practice and they never replaced her. She is where I did learn about CBT-I. She suggested an APP called CBT-I Coach. When I used it and loaded up my data, it said I didn’t sleep enough (it couldn’t help me) and to work with a physician. A frustrating loop.
I’ve attempted to find other practitioners for sleep, but it seems everyone I’ve encountered has the same mindset…sleep apnea. If you don’t have sleep apnea, well, they can’t help you. I suspect this is more of a problem with the US healthcare system and insurance incentives/disincentives, but that’s a topic for another forum.
So after a review of the literature over the past several months I’ve come up with a protocol that I’ve refined and am now 2 weeks into.
Since light and exercise are both intense signals for the body to be awake, I’m combining them with sleep restriction. Sleep restriction is very mentally challenging as you said. After I put the kids down all I want to do is pass out, and this is already hours after I’ve wanted to be in bed. I get sleepy at 3-4pm.
My typical bedtime is 8pm with a goal wake time at 4-4:30 am due to work schedule. Prior to this new approach, I would go to bed at 8pm but after 4 hours I’d wake at midnight and be unable to sleep any more.
With the new approach, I’m using a set of light therapy glasses in the late afternoon (~4-5pm) to overcome the urge to fall asleep (they only work if you can keep your eyes open 
I have found the days I am consistent with using the glasses and the timing, when I get that super strong urge to fall asleep around 4-5pm, those nights I have slept better.
Yesterday was a good example of this. At 4:30 pm I could not keep my eyes open, so I put on the blue light glasses for 45 minutes. While I did nod off a few times briefly and did not get to exercise due to circumstances, I managed to get to bed at 11pm and slept solid until 4:30 am today. A solid 5.5 hours for me is a win right now.
For the protocol, later I pair the low intensity HR+ workouts with more light therapy in the evening at what would be the normal bedtime in order to stay awake, pushing the bedtime to more around 11pm.
Until last night I’ve been consistent with the exercise, but the timing of things has been a bit off with all the extra family things related to this time of year. There have been times when I didn’t get on the trainer until after 9:30 pm. The mental struggle of starting exercise this late is intense.
I’ve started to notice some small shifts but they’ve been inconsistent. Some days I have been fortunate to make it till 4am, but most days I’m still getting just the 4 hours, it’s just shifted from 11pm to 3am. And the dreams have been wild. I had no idea Taylor Swift was a leader of the Star Wars Rebel Alliance! 
I have read in the literature that this type of dreaming is temporary and a sign things are starting to work perhaps.