Being disappointed by the lack of response to my original post, I decided to experiment and buy a cheapo Lightning-to-USB jumper cable with which to try a wired extended keyboard with my iPhone 14 PM.
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Lo and behold, it worked immediately on the Pages app. But, after a minute or so, a tinted box appeared around the 'live’ paragraph and then the screen started cycling between the hardware and the on-screen keyboards (see attached video). The hardware keyboard is inactive when the on-screen one is displayed, which means that any text keyed in during those periods is not included. Does anyone know what is going on here? This so nearly works that I think it would be worth pursuing.
As to connecting a Magic Mouse or Trackpad to an iPhone, opinion seems to be split between ‘there's no cursor to be controlled’/‘no, it's not possible’ and ‘yes you can, through Accessibility>AssistiveTouch’. I am trying to eliminate the frustration of trying to reposition the text cursor in Pages with a finger-end that spans 2-3 lines of text. Again, any help would be much appreciated.