On repartitioning Northern Ireland

The current riots in Northern Ireland reminded me of this old article at Strange Maps: Is Ulster Doomed?. Since this year marks the centenary of the original partition of Ireland, so it is perhaps time to reconsider the current arrangements. As things stand under the Good Friday agreement NI remains part of the UK until the population wishes otherwise. Depending on how you count it polls suggest growing levels of support for a change.  

However, reunification would have a high cost for the Republic (assuming the UK ceased all financial support for the province), while leaving a large population unhappy with the result. A co-dominion would be a short-term solution, but would probably only delay the event.

So let's look at a more off-the-wall suggestion, as brought up by that Strange Maps article: repartition. Looking at the last general election result we could see the new borders set so:

While the 2017 map is basically the same:

These are both similar to one of the images from Strange Maps:

Each territory would have roughly half the current population, this would be an easier amount for the ROI to absorb. As NI would no longer exist the current border situation could be revised to resolving many of the issues since Brexit. Also for geographic simplicity, Belfast would remain one city, not with a West Berlin-style enclave. 

Obviously, any new border would have people on 'the wrong side', especially in Belfast.  One way to ensure long-term stability would be for population transfers. Maybe all residents could be offered a choice between staying put and accepting the status of the territory where they live, or they could be given financial support to move over the new border.

Finally, I would suggest renaming the part remaining in the UK British Ulter to distinguish it from Ireland. It would be a constituent nation of the (renamed) United Kingdom of Great Britain, with its own local government but more integrated than NI is currently.