Is there a sort of flash unit with non-IR focus beam?

Is there a sort of flash unit with non-IR focus beam? I'm shooting (as a volunteer) with a mirrorless (Canon EOS R) with a Canon Speedlight 430ex, and I have shoot coming up at a dinner/dance for a local university. On/around the dance floor the camera's autofocus fails to work when the light is really low. I understand this is because the camera uses the main sensor for autofocus, and that can't d...

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