Yea whether you'd be entitled to a grant would be determined by your income in the previous year, you can check these limits on the studentfinance.ie site.
Although fees in some format will most likely be back by next sept, I think sufficient time would have elapsed that the cert in electronics wouldnt affect it. You should however closely check out the Irish language grade requirements and Id imagine if you were applying as a mature student it might form part of the interview.