You are offering a fair deal.
You know he is going to be angry - expect that. I'd plan on not answering phone or email for a few days.
Lay low - out of firing range!
And be proud of yourself here. You are being more than generous. You could go for full custody, no visitation until he's done a year in locked down rehab with Dr. Drew, at his own expense.
Take good care,
~T