Capturing only queries with --echo-hidden option?

Hi. I was playing with the -E option a bit[1]. If I do for example a \d,
the queries and the regular output are interspersed on the screen. I see I
can use \o to send the regular output to a file, leaving only the queries
on the screen. But is there any way to do the reverse (capture the queries
to a file, output on screen), and/or send both streams to separate files?

If there isn't, would this gain any traction as a feature request?
Something like --echo-hidden=<filename>? I can't say it would be top of my
feature request list, but it seems like it could come in handy from
time-to-time, and maybe more so for others.

TIA & Cheers,
Ken

[1] I was wondering if it might be a helpful way to narrow down the
unrecognized node type error described in
https://www.postgresql.org/message-id/CADTdw-yGfNyHSLXajBFgCEod9dCh8Ys2%3D9j-gNh6kX5oEpkRNA%40mail.gmail.com

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