I am sorry to hear of your situation.
All I can tell you that the sooner you get off the CR the better. I feel like you stated you need to be on it for chronic insomnia correct?
This is my personal advice being that I was originally prescribed the dose of clonazepam you are on and I was also on CR in the beginning. I don't know your specific situation but with mine....all I can tell you is that when I figured it all out I wanted off. I stopped the CR and clonazepam dose of 1.50-1.75 would knock me out for the night.
I don't advocate benzo use at all and I am in the middle of my never ending taper. Which I will finish this year

.
What I would hate to see is you have to add something else in the mix especially something in the benzo family because then the amount of valium you are going to need is going to be huge! Right now at 3mg you are on 60 mg's.
Glad to hear you have a supportive doctor.
Best of luck to you and I am sorry i don't really have a great answer for ou not knowing what your goals are in all of this.
Regards,
Traycee