If it is for a work of fiction, then perhaps you are better off going with one of the terms Braoin has coined, since they'll have less attached cultural preconceptions:

Or perhaps just:

Is athraitheoir mé. I am a "changer".

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

That's perfect. I actually was planning to call them 'changers' at first but then I wasn't sure I could get a word that would work. Thank you so much