Edit: I would also be willing to reward the bounty if someone can partially answer the question by stating if my proposed IPA is possible based on the description or not.
I am specifically asking about the dialects of Irish spoken in Connemara that have a tendency for a "slender" r with a distinct buzzing. Some friends and I have been discussing this topic on the Irish Language Learner's forum and we cannot come to a consensus. I believe that it might be [ɾ̝ʲ]. The sounds has the teeth closed so that it has the buzzing quality of /ʒ/ but has the lamina raised and tapping the tooth ridge - unlike /ʒ/ which has the posterodorsal part of the tongue bunched up.
Here are examples on Forvo of the sound in question. If there are multiple pronunciations take user BridEilis as the example.
Tomás de Bhaldraithe's description in The Irish of Cois Fhairrge, Co. Galway - A Phonetic Study
223.r' represents a voiced palatized flapped alveolar sound. The tip of the tongue makes one tap against the front part of the teeth-ridge. The sounds strikes the ear as somewhat similar to a short voiced palatized alveolar plosive. When in final position, the contact is released very slowly so that a slight affrication is heard.
The emphasis on the final sentence is mine as this is the specific sound I am asking about. Here is an image of what I believe the IPA might be.