Nurses are on demand like never before in Ireland. You have choices of applying to most hospitals who will be hoping to employ you asap. I would bet your time demands will be met. Depending on the hospital you choose it might be a good move for you to offer your exclusive service. With night duty/weekend duty demands you might not have the spare capacity for more part-time work.
If you work night duty shifts it is likely that you will work 74 hours in a seven day shift i.e. working nearly a two week shift in a week. Your fortnight's work obligation is for 78 hours so it appears that perhaps you have some spare capacity. I would warn though against burn-out. This is only my opinion.