While I get that your intentions are good, if your proxy has a vulnerability, it can be exploited. Many people use nginx as a proxy, and it has its own vulnerabilities that have been fixed over the years. You may have solved one problem while opening up another. Even those fronting services have their own vulnerabilities that have to be fixed.
If a system is accessible by someone else, it is inherently insecure and needs to be hardened.
If a system is accessible by someone else, it is inherently insecure and needs to be hardened.