General Principles for Reducing Bias
APA Style guide principles for reducing bias in writing. This would be a good resource for elearning style guides too.
This tool is geared mostly for podcast producers, but it might have some applications for elearning. When you record audio, it generates a transcript. If you want to edit out some text, you can edit it via the transcript rather than editing the wave forms.
The other interesting feature is "Overdub," which uses an AI generated synthetic voice based on the real voice to fill in changes. If you need to make minor edits in wording, you can use the synthetic voice rather than re-recording the sentence and replacing the audio. You can certainly hear the difference, even in their demo, but i bet for quick edits it would be good enough.