so, let's get this straight. he is insisting on remaining in the family home because he wants as much quality time with the boys but he will be busy and unavailable next weekend and also the following weekend?
i find the best plan is the one that does not rely on the alcoholic to do anything. that is the plan which can be executed because it is wholly within your control.
have you considered moving out with the boys into a temporary rental or with family until the divorce is settled?
and, if i may ask, what is your emergency escape plan? where will you go? your situation might explode in a minute and if you have a clear plan, you will be able to execute it under pressure.