DL has changed the flights on my itinerary several times. The big change being that they cancelled the PRG-ATL flight for the winter.

So they rerouted me SOF-PRG-JFK-ATL-MLB. Now they have changed the JFK-ATL flight departure time so that I only have 1 hour and 20 minutes to clear immigration and customs (I am flying BE so I should be one of the first off the plane and to the immigration line).

My itinerary indicates that I should call an agent about this issue. But before I do, I could use some expert advice.
They can rebook me on the next JFK-ATL flight, but that results in only a 30 minute connection to the last ATL-MLB flight of the day. I'm not sure what the legal connection time in JFK for an arriving international flight is and I think that the legal connection in ATL for domestic is 40 minutes.
So it looks like I'm in a situation where I can't get there from here in a single day. As a future DM, a current PM and MM with 156k MQMs for the current year, what is the best I can hope for here? Am I going to have to fork out some buckage for a hotel in ATL or will DL cover it? Will DL put me on another airline to get me to ATL so I can make a MLB flight on the 23rd? It is Christmas and I really needed to get home on the 23rd. The original itinerary was fine with suffcient layovers to cover any reasonable delays. Now the flight schedule changes have created a hug nightmare.
I'd like to know my options before I get on the phone with DL so what do you all have to say about this?
I guess I should have seen this coming but I doubt I could have made a pre-emptive move when the current flight schedules were not available at the time I booked this flight.
Thanks in advance.