I agree, the subjects would definitely be worth the effort & expense. {the Empress Elizabeth musical, I thought was beautiful, & I do not speak or understand German, but the story was so familiar, it did not matter].
I reckon, that if the Titanic & Eva Peron merit musicals, & the king of Sweden an opera, why not the Romanovs?
In an area such as this, however, talent on all fronts must be pretty supreme.