I’m not sure if you are still monitoring, but I have been trying this in my head all day. I just saw your post and wanted to share my thoughts.
What if you:
-Install WP separately on its own hosting (or sub domain, etc.)
-Change the DB login info to match the main DB you want to use in the config file(s)
-Change permalinks or any other references to your domain name to pull dynamically from the current page URL less anything after .com/ using a modified version of:
if($_SERVER['HTTPS']!=="on")
{
$link = $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
if (strstr($link, 'www.')) { $www = ""; } else { $www = "www."; }
$https = "https://";
$redirect = $https.$www.$link;
header("Location:$redirect");
}
Then it does not matter which site you login to, the content would be the same, and you could still use separate themes, etc.
Again, this is all in my head…
