Could marriage and succession rules be adjusted for a Japanese princess?

Would Japanese marriage rules and the Church of England prevent the Duke of York from marrying a Japanese princess?

The proposed workaround is a negotiated exception with children raised in the Church of England and excluded from the Japanese succession, approved while the Duke remains the spare.

Objections to the hypothetical marriage include Japanese imperial rules and the British monarch's relationship with the Church of England. Clarke thinks a sufficiently attractive diplomatic arrangement could obtain legal exceptions. His scenario keeps the children outside the Japanese succession and allows them to be raised in the Church of England. The Duke of York's position as a spare makes approval easier to imagine in 1923. Edward's later abdication would activate arrangements that officials had expected to remain theoretical; the exchange offers a counterfactual workaround without working through the legislation.