If it is an organisation from the UbuntuNet region, they are also welcome to join our regional federation unIDa. Or if they want to invest some more effort, they can setup their own (national) federation themselves using our Resource Registry https://rr.ubuntunet.net/.
While this makes sense from a geographical perspective, unIDa is unfortunately not yet part of eduGAIN. But seeing that GrIDP has been accepted recently, I will propose unIDa again. Last time I was told that we can't join as a regional entity, federations are supposed to be national.
Anyone interested in joining unIDa or setting up their own federation can contact me under email@example.com.
Ps. @brucellino: How do I get the unIDa federation added as a login option to this forum?