The B-1B had the engine fire last week. It's been sitting on the ramp wherever it diverted too for that long. Its been hopping along from base to base i'd say on minimal fuel and only two of the three engines.
I think it will hop along more to Dyess via as i said, one of the Atlantic divert bases either Keflavik or Lajes.
I Should imagine it would need to go the land hopping route because surely if you are in an aircraft cleared to cross the pond with 4 engines, and you have one engine missing, and possibly only using two of the three then this would be a limitation on what way you could go over the Atlantic (like ETOPS or whatever it is called)...