I tried that with an iPad once - if there's a way to do so without looking faintly ridiculous I'm all ears. But I'm an Android person as far as phones go, lack of a standard system wise undo command isn't quite enough to send me back to Apple.
My solution to this would be to enable the Assistive Touch button and set its double tap action to 'shake'. If you don't want the button all the time, create a personal automation shortcut which runs when a specific app opens and closes, setting Assistive Touch on and off as you wish.
Alternatively have Voice Control enabled and say "undo that".
I've been wondering what I'm supposed to do with my third thumb. /s
I just tried using this in a text screen. My first attempt was on the keyboard which added random characters and brought up the little thing at the top to undo, my second attempt was above the keyboard, but my most recent message was a link so I got taken to safari, and my third attempt in a small sliver of the message screen in the upper left worked.
Obviously if you're familiar with it, it's easier to do, but I rarely have three fingers available while I'm writing text on a phone.
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