No Brendan, that wouldn't work.
Let me try and explain it a different way.
For reasons of cost and administrative simplicity, the Bank/Department want to limit the number of jurisdictions whose laws they need to comply with or even consider. Accordingly, the offer (as reflected in the prospectus) is only addressed to and directed at persons in Ireland and in the United Kingdom and otherwise at "qualified investors" (essentially financial institutions) in other EEA member states.
This has nothing to do with citizenship. In fact, it would breach EU law to limit the offer to Irish citizens. A Spanish citizen, for example, is perfectly entitled to take up the offer if they live in Ireland and have an account with an accredited intermediary.
Neither the Bank nor the Department can unilaterally contract out of any applicable laws. As such, investors can't simply be told that the offer may not lawful in their jurisdiction so if they take up the offer they do so at their own risk. That doesn't prevent or preclude a disgruntled shareholder from subsequently seeking redress on the basis that the offer was unlawful in their jurisdiction, which is precisely what the Bank/Department want to avoid.
The bottom line is that the way the Bank/Department is proceeding is what works.