That sounds as though you are in with a fighting chance at least with the cat who will soon show Milo who is boss. A couple of nose swipes with a sharp claw will soon have Milo leaving a healthy distance between him and the "Boss"
I think your main problem will be Milo's reaction to the rabbits if they are kept as free-run house pets you will have to proceed with a great deal of patience and never leave Milo alone with them.
The only JR I ever had any dealings with was a lunatic. He was "trained" but it only kicked in when he had let off steam which in the main meant that he ran in circles at great speed. OK if he was in a large field but if he was in a room then his run would resemble a "Wall of Death" dash at the height of the back of a couch.
So good luck, I am sure the next few weks will be....errr ...intestesting.