Alright pal congratulations on the new job.
Don't worry to much about it you just have to make sensible choices. Yeah it's more difficult mentally because there is now temptation thrown your way. You don't have temptation at home if you remove it from the house.
I work offshore on the oil rigs sometimes on land sometimes at sea. Currently just come back from Saudi. The food choice is limited but you just have to make the educated choice and it sounds like you been doing great for the last 5 years so you will find that you should just fit into this nicely.
I don't have a plan as such but think about it this way your only change really is your not cooking it yourself! Just have your steak with no sauce, like you probably did at home... I always find somewhere that's nice for steak or chicken, have it plain or with herbs/spices and ask for 2 sides of veg, like broccoli or similar, look out for what veg have a high carb content like carrots and potatoes and try and avoid...
Hope this helps
Again congratulations and good luck in the new job and food!!!