Three handed dual timers work for most people. I have a Magrette Dual Time for that. In fact, for those that crave "military" time, something like a purist 24hr Glycine would probably fit the bill. I have one as my daily wearer and it's easy to adapt to the dial and telling the time. In fact, it takes a bit of getting used to a 12 hour dial when I revert.
As for 4 hander GMT watches, I tend to look at them like chronographs. Most people are going to use the added functionality rarely. A simpler watch will be less hassle and do what you need it to do 99% of the time. For the other 1% there's smartphones :)
As for 4 hander GMT watches, I tend to look at them like chronographs. Most people are going to use the added functionality rarely. A simpler watch will be less hassle and do what you need it to do 99% of the time. For the other 1% there's smartphones :)