Have a chat with your local office about your situation. The rulkes regarding 'frontier workers' will probably come inot play and it's probably too complicated for general advice here as you could easily be led astray by us idiots! Talk to the experts!
5.5 Partially or Intermittently Unemployed Frontier Workers
A partially or intermittently unemployed worker shall receive benefits from the State of employment. The benefits will be provided by the competent institution according to its rules and conditions, and at its own expense. The unemployed person will not be able to claim benefits from the State of residence while he is receiving benefits from the competent State.
Seriously though, this is a very complicated area, i think the advice of the above poster is sound, you need to talk to someone. If you're not comfortable talking to welfare about it (as they may take an adverse view of you refusing a job), then probably best to talk to the likes of Migrant Rights Centre http://www.mrci.ie/ , or the EU Commission http://ec.europa.eu/ireland/about_us/index_en.htm