Your eligibility to act as a reporting accountant is dependent on whether you meet the definition of regulation 26(4) of the solicitors accounts regulations as a “reporting accountant”. Section 26(4) defines the reporting accountant as follows;
(4) A “reporting accountant” (which shall where the context so admits or requires include a firm of accountants), for the purposes of these Regulations, shall mean a person who—
(a)(i) is a member in practice of any one or more of the following bodies, namely—
(A) Chartered Accountants Ireland,
(B) The Institute of Chartered Accountants in England and Wales,
(C) The Institute of Chartered Accountants in Scotland,
(D) The Association of Chartered Certified Accountants,
(E) The Institute of Certified Public Accountants in Ireland,
(F) The Institute of Incorporated Public Accountants; or
(ii) not being a member of one of the bodies referred to at (a)(i) above, satisfies the Society that he or she has adequate professional experience and competence in the auditing of accounts; and
(b) is not and never has been a partner, consultant, clerk or servant of the solicitor concerned; and
(c) is maintaining such minimum level of professional indemnity insurance cover as the Society may appropriately and reasonably direct from time to time in order to provide for indemnity against losses arising from claims incurred (inter alia) in connection with his or her professional practice as a reporting accountant, and
(d) is approved by the Society.
Chapter 5 of the attached link also provides some Law Society guidance on this (https://www.lawsociety.ie/globalassets/documents/committees/guidance/settingup.pdf)
So, assuming you are a member of one of the bodies (holding a practicising certificate), have no indepence issues regarding ability to act for the solicitors, have minimum PI cover of €500k and have not had approval withdrawn by the Law Society then you would appear to meet the criteria for acting as a reporting accountant.
Regulation 26(4) does not refer to the requirement that such a person is a principal or partner so I would clarify this and sign off as “responsible individual”.