The UK conducted nuclear tests there, & in the worst case, if the target is in the uninhabited desert, that's where the enemy will strike. Also, we been told many times that "the most survivable leg of the nuclear triad is the SSBN force that can stay undetected (even by US forces), thus insuring a 2nd strike capability". IMO, it's a bad idea to put all eggs in 1 basket by combining tactical & strategic missions on the same platform that as a result will have less chances of staying undetected. Even the less affluent Russians, French & British don't think of doing that. But, notwithstanding the above, a better solution is to develop a longer range sub/supersonic nuclear armed SLCM that could be launched from existing &/or future SSN/SSGNs- it will save a lot more $!