Hi
This is a limitation of the shared hosting platform as opposed to anything within WordPress. The software reads what is output from the server, so WordPress (and its associated plugins/themes) is not aware whether this is a local/global setting (it’s the only one available) so without control of this parameter our software will not run. Hope this makes sense?
We do offer custom migration services for edge cases however and would be happy to have a look at this one for you? Having this little control of the server is unusual and my concern would be there are other limitations that may restrict a seamless automated process e.g. can the site run on latest versions of PHP etc.
This case needs some investigation and if this is something you would like to pursue please raise a ticket here: https://www.seahorse-data.com/wp-on-aws-support-portal/ quoting the forum thread title and we will pick it up there.
Thanks – Seahorse Team