While I‘m not quite sure of the meaning of these words in bold as I don’t think “please” can be a noun, it still looks like a past participle clause. Interestingly, some textbooks in my city (Hong Kong) call it a “past participle phrase” but generally more authoritative grammar reference books call it a “past participle clause”. So I’d go for “clause” in my understanding and teaching.
The concept in question should be whether the participle (i.e. “unconcerned” in your case) is considered a verb. A verb makes a clause; without a verb, it’s a phrase.
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