How to deal with Slow HTTP POST (slowloris) vulnerability

No, there is nothing you can do if you are unable to modify the HTTP server behavior. The reason is that the HTTP server receives and processes the initial request and then hands it off to PHP. PHP then processes the request and hands the response back to the HTTP server, which then sends it back to the client.

PHP does have a built-in HTTP server but it is HIGHLY unlikely that Kinsta is using it and it does not appear to offer any kind of configuration and moreover, is not recommended for production or even public use. See https://www.php.net/manual/en/features.commandline.webserver.php for details.

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