Google COWS scale and study it. That is what doctors should use to induce rather than a number of hours. Can't help with Clondine, I just bit the bullet and got sick. I waited too long because I was so affraid as well, but don't regret it. Good luck.
Why are you coming of all of this CT instead of tapering one at a time? Fentanyl is a hard drug to CT from.
Clonidine will help with some of the withdrawals symptoms. Get the ingredients for the Thomas recipe; many say it helps a lot.
I agree about googling the COWS scale because you definitely don't want to start this too soon.
You must have some pain issues in order to be on all the meds you're on (been on a similar amount, maybe a bit more but tapered.)
Alteril will help with sleep issues. Stay very hydrated.
Are you going to be given the suboxone in the doctor's office?