That is a correct transcription. I would do it the same way.
So, the answer to the question of "Can I use a single-word switch indicator for a word immediately following an opening grouping sign?" is "Yes." And, if you do use a single-word switch indicator for a word immediately following an opening grouping sign then the closing grouping sign should be preceded by Nemeth Code material and so also be in Nemeth Code (as it is in your attachment).
Neat question. Thank you for sharing!
–Kyle
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This reply was modified 4 years ago by kdejute. Reason: Removed "And, if you do use a single-word switch indicator for a word immediately following an opening grouping sign then the closing grouping sign should be preceded by Nemeth Code material and so also be in Nemeth Code (as it is in your attachment)." because that is not required
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This reply was modified 4 years ago by kdejute. Reason: Return response to original