If you have a service provider that want the SAML to contain
This value is set by Siteminder to the actual endpoint for the service: Recipient="https://xxxx/xxxxx/xxx"
Is it possible to have a different Recipient than the actual endpoint?
Per Oasis SAML 1.1 specification The SAML response MUST include the Recipient attribute [SAMLCore] with its value set to https://<assertion consumer host name and path>.
Reference (line 770)
Moreover, Assertion can be customized using the custom plug-in but the standard out-of-the-box assertion would not have a direct configuration to do that.