If you want, you could upload a zip of the changed files here in the thread of the topic.
Maybe some other users would like to have it.
If it is fully integrated with a choice what to do and does no disable the standard settings, you might want to use the GitHub in order to apply your changes (after a review and test of the main developers and maybe slightly changed) to future versions of JEM.
I know this was an old topic and there were recent reply's so will reply.
You know as many of us just need to check for city what can be done is to display the field "city" at default and remove the fields "continent" + "country" at default. if someone needs it he/she can add it later. This will some modifying of code but it's not that difficult.
If someone wants to know how it can be done then let's hear it and i'll show it.
==> that said, it will be changed in JEM for Joomla 4.
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