I would at least hit up the core exercises at the same weight at a minimal volume. That way you could even hit the deads and the squats on that one day a week. Even if your were to take the weight you're currently working at and just do 3 sets of 3 that should help a lot to maintain motor pathways. And then whatever else you feel like doing for that one day.
On the other days while you are traveling you could do things like handstand pushups, one-legged squats, deadlift anything that's heavy
, pullups if you can....basically just do things to let your body know that it's not over if you get my meaning. But your basic muscular strength should be fine. It's the neural pathways that will decondition the soonest so that's why I say to hit up the low volume core moves to help maintain that. Because it's a big drop in intensity that will do the most damage, not necessarily the drop in total work. Nothing complicated.