Plurals of quotations: “Chorus of ‘Hello’s”; “Ooh”s & “Ah”s [duplicate]

I recognize this is an old question, but I ran across it while looking for the answer myself, and thought I'd offer up Chicago's thoughts on the matter.

Per CMS 17th ed, chapter 7, section 13:

Plural form for words in quotation marks. The plural of a word or phrase in quotation marks may be formed in the usual way (without an apostrophe). If the result is awkward, reword. Chicago discourages a plural ending following a closing quotation mark.

How many more “To be continueds" (not “To be continued”s) can we expect?
or, better,
How many more times can we expect to see “To be continued”?

So in the case of the original question, Chicago would expect

He was greeted with a chorus of “hellos.”

and

Her daring earned “oohs” and “ahhs” from around the room.

“Her daring earned oohs and ahhs from around the room” would be most correct. Adding an apostrophe would denote possession; e.g., "Her daring earned ooh's and ahh's from around the room." The ooh and aah would not be plural in that case but would be subjects of the sentence showing possession. The ooh's what? The aah's what? Also I would do away with the extra quote within the quote. There is no need to set off the oohs and aahs with internal quotes. Internal quotes within a quote would be used in the case of a character speaking and quoting someone; e.g., "I was there, I tell you. I heard John say,'Don't you dare come one step closer, or I will do it.' It was so frightening to hear him threaten us in that way!" I would also do away with the capitalization of the oohs and aahs. Capitalization is reserved for nouns (people, places, titles--for some examples).

The form of “Her daring earned ‘Ooh’s & ‘Ahh’s from around the room” looks better to me than that of “Her daring earned oohs & ahhs from around the room”; but opinion aside, I don't know an authoritative answer – except, perhaps, the advice to reword to avoid plural forms. The example might become: “Her daring earned exclamations of "Ooh!" and "Ahh!" from around the room.”