I would leave the case size and material unchanged due to budget. Love the airport codes. The only change from your suggestions: I would prefer a red-dark grey ring instead of a red-blue one. Red-blue is Rolex GMT.
From your comments I gather you are happy with your decision. Wearing it daily is a strong statement, especially knowing some of your other watches. Wow. I am considering the exact same version, steel with black dial. Would probably take this as an opportunity to significantly reduce my collection i