The treaty is with the Russians. Not a good idea to violate it, and it's not necessary. When I was in the USAF it was SLBM's that were most feared because their flight time is so short. I'm sure there is one or more boomer cruising off the Korean peninsula, ready to take out the prime targets if it comes to that.
Agreed, there are likely a bunch of Tridents on the ready...
Too much money to spend for not giving them a chance at (more or less) the action for which they were designed.
Let's hope it doesn't come to that.