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Yes, that's exactly the way I'd indicate that you as the writer/transcriber are uncertain if the word you're indicating is correct. As long as you're making it clear that you're quoting something, ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/19463 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/19463 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/