S/F's last international was GP Espoo that ended on Nov. 26, 2022:
http://www.isuresults.com/bios/isufs00101515.htm
ETA:
https://isai.ie/wp-content/uploads/2022/02/Section-100-General-Rules.pdf
103.2.3 Competitive Partner Member
This category of membership is for any individual who has a critical partnership with a
ISAI member in Ice Dance or Pairs participating on skating programs, competitions, and
events of the ISAI and other ISU member federations. A Competitive Partner Member is
entitled to enter club competitions or higher as per these Rules and Regulations. It
entitles the member to receive notification of meetings of the Association as per the
Constitution but does not allow the member the ability to speak or vote at such meetings.
Such a skater who is vital to a competitive pair and/or dance team will be deemed a
member ONLY as long as they are vital to the competitive pair or dance team. The
criteria to join as a Competitive Partner the individual MUST
-Be part of a competitive Pair or Ice Dance team, where the other skater is
either a Full or Youth member.
-The partner must comply with ISU Rule 109.
-Be released from their national federation at no cost to the ISAI.
To be eligible to compete internationally for Ireland, Shane would have to hold Irish Citizenship and Skate Canada would need to release them "at no cost to the ISAI."