Oh, sorry, but I didn't provide any answer because there apparently isn't one.
I did some investigation and found out that the Gmail app was specifically designed to not send text-only emails. I found this piece of information on several sites, and I then incorrectly assumed that it was widely known. So I figured that I would just be wasting bandwidth and behaving like a bothersome newbie by restating here what I then thought was something that most other people already knew.
But anyway, we're apparently SOL when it comes to sending plain text emails via the Gmail app.
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