Hi Everyone,
I have a issue in a customer, where we have 2 portals installed, and 2 different sso solutions at the same time.
Regular salesforce users log in through login.salesforce.com or custom url.
Customers from portal 1 go through IDP 1
Customer from portal 2 o trough IDP 2
Both IDP SSO configs are SP initiated (they have to start on salesforce).
My issue is:
I need a way to avoid going to the login page and actively chose one of the logins methods.
Salesforce generate the login links as follows:

https://my.custom.salesforce.domain/saml/authn-request.jsp?saml_request_id=_2CAAAAVZTcY0mME8wbTAwMDAwMDA0Qzk0AAAAypQs87MjXfKGfnOM29wBsHYId_Alz7ZZxK9jm0Sw2ElCsi4NGRR0OeIj1-asA8CLNDxFCpFjK3Cu4pxu031lK7RQaxwGRPuw4eI9nnPtleFYfR_5_eIXAAE0Dcp7zHjceZXj1q7Ivl5_Prgc0wDl7YmXkt53qOVr8bJ2oAPtR-CMj-_XB_KDi7URAcJnjWDvsseG0z15wSpCwN52nhB9QzWJWwvZTJ0BwYxS9ex4PJHrP8UPSS-pgnBiiG9oPLQp5g&saml_acs=https%3A%2F%2Fmy.custom.salesforce.org%3Fso%3D00Dm0000000CqC7&saml_binding_type=HttpPost&Issuer=https%3A%2F%2F.my.salesforce.com%2F&samlSsoConfig=SSoCOnfigId&RelayState=%2F

Is there a way to programatically chose a connection method or to manually generate the saml_request_id
Anyone has any thoughts on how achieve that without going the IDP initiated SSO???
Cheers