Is "(t 某某, s 某某)" accepted notation for showing traditional and simplified characters together?
Never.
Although you may think such notation is convenient, Chinese people really dislike using Latin notations in Chinese books, especially for linguistics.
They use:

&quot;动&quot; instead of &quot;v.&quot; for verbs
&quot;名&quot; instead of &quot;n.&quot; for nouns
&quot;繁&quot; instead of your &quot;t&quot; for Traditional Chinese.