Follow-up Comment #1, bug #55799 (project groff):
Heirloom troff has also implemented the .char request (recognized when using
-x2 or higher), and its -a output works as expected.
$ printf ".char a z\nplan\n" | heirloom-troff -a -x2
plzn
$ printf ".char a z\nplan\n" | groff -a
<beginning of page>
plan
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