An Irish Ireland, a north-south border or a British Ireland?

The pro-British establishment in Ulster and Westminster are seemingly indicating a proposed border poll as an answer to conflict. A result in the negative along with other agenda would indicate a new British united Ireland, but some people object on behalf of ethics.
A border is necessary for EU protocol. It may be time to ask northern Ireland to join Ireland in Europe. Failing this, Ireland could decide to continue with the European union or join Britain.