Hypothetically, the United Kingdom has decided to separate, Czechoslovakia style, into England-and-Wales and Scotland. The UK ceases to exist with the two new countries as equal successor nations.
In Northern Ireland, the Nationalist community would prefer to join (The Republic of) Ireland. Which new country would the Unionist community prefer?
(For the purposes of this hypothetical, Brexit never happens and Queen Elizabeth II becomes Queen of the two new countries. I'm more interested in the long term rather than considering temporary blips.)
I understand that there isn't going to be a single definitive answer that 100% of that community are going to agree with. I'm interested if there have been any studies that have evaded my searches or simply the opinion of someone close to or part of that community.
UPDATE: Please don't get hung up on the hypothetical scenario or how likely it is. I pose it only to enable the question of where the loyalties of the Unionist community lie.