Oracle Forms Single Sign On (SSO) without OAM

Has anyone found a way to provide SSO to Oracle Forms services without the need of OAM?  Our Forms services are running behind a security appliance that provides authentication in both HTTP headers and a custom cookie.  The introduction of OAM into the mix is unnecessary and is not providing value.  I'm still waiting on Oracle to adjust the Forms services to accept trusted cookies or headers as an accepted means for user identification and authentication (support for trusted external providers).

Has anyone used otherparams to provide the user identity from a security appliance?  The security appliance would intercept all calls and replace the useridentity within the otherparams ensuring that users would not be able to falsify their identity.