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'that once' is correct and can be used in written English.
You can use it when referring to something that happened in the past and is now finished. For example: "I used to be scared of public speaking, but I conquered that fear once."
Exact(58)
"Say that once more.
For that, once again, I'm sorry.
I'd only be good at that once.
I felt like that once, too.
I knew a guy like that once.
I've thought about that once or twice.
That once would not have been enough.
He could get away with that once.
That, once again, seems very Lorde indeed.
Similar(2)
Then that once-great company dies. .
Planning that once-in-a-lifetime trip?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com