Joseph Turner <joseph@breatheoutbreathe.in> writes:

> Thanks, Ihor!  Tested working on my machine.
>
> Here's another potential solution to consider, which adds a defcustom to
> let the user decide how to handle forbidden characters:
>
> https://github.com/kjambunathan/org-mode-ox-odt/commit/07fde1e9b7cdda3e3ef8136f5b1d478499dfd780

Good idea!
I went even further and used a proper export setting.
See the attached 2nd version of the fix.