I think the easier option here would be to join from both your iPad and your normal PC.
Teams supports multi-device join, so your iPad will automatically mute/not join video.

Then you can share a whiteboard from there?

Other options include things like meeting rooms with content capture cameras (Supported in MTR) or the use of a whiteboard aware camera like the Huddly or Logi Scribe.

Hope this helps.
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