Can I bypass CORS Preflight for a released version?

The title pretty much says it all. I know I can bypass it in my browser with --disable-web-security (for chrome) but how does it work for releasing the app? I have no access to the server that is set to deny reverse proxies and only accepts GET requests not OPTIONS this leads to prefight issues. How can I work around this?

I’ve taken a look at these but they don’t seem to answer the prefight issue. Any Suggestions/workarounds? I only want to talk to the servers side admin as a last resort and if I have to what origin do I give him thats safe for hybrid/ionic apps as it would not be localhost:8100? Thanks