These explosions seem to be very rare events. If the 1945 techonology can do the job, I say go with that, while developign the rail guns on a follow-on class of ship.
Plus Mutsu in 1943, Roma in 1943, Hood in 1941, Queen Mary, Invincible, Indefatigable, and (almost) Lion at Jutland, the ex-Novorossiysk, 1957, Arizona, 1941.
These explosions seem to be very rare events.
On a statistical basis, it's not that rare at all, because the installed technology base in question is so small.
If the 1945 techonology can do the job, I say go with that, while developign the rail guns on a follow-on class of ship.
Meeting acceptable safety standards with 1945 technology will take longer than starting from scratch and developing new technology that avoids this issue.