Is there a way to remove apaches Reverse Proxy Request Headers?

Since Apache 2, as this pretty answer says, the

ProxyAddHeaders Off

theoretically disables it. In my experiences, it had no effect. However, combined with

<Proxy *>
  ProxyAddHeaders Off
</Proxy>

and, with

  RequestHeader unset X-Forwarded-Host
  RequestHeader unset X-Forwarded-For
  RequestHeader unset X-Forwarded-Server

somewhere it started to work.

corrected answer: there is no way to do that since its hardcoded

to fix this in the source code of mod_proxy_http.c search for the following part:

    apr_table_mergen(r->headers_in, "X-Forwarded-Server",
                 r->server->server_hostname);
}

and immediately after that add this code:

// remove any X-Forwarded headers
apr_table_unset(r->headers_in, "X-Forwarded-For");
apr_table_unset(r->headers_in, "X-Forwarded-Host");
apr_table_unset(r->headers_in, "X-Forwarded-Server");

then compile by running apxs2 -cia mod_proxy_http.c