Advise on KeyCloak broker configuration for SSO from external SAML and 2 keycloaks

I have a case when users need to login via Okta to broker where I have configured instance of keycloak having SAML IDP initiated SSO.

Broker would need to redirect on successful login to one of 10 instances of KeyCloak installed in every tenant. I have configured between broker KeyCloak and tenant KeyCloak OpenID Connect (OIDC) SSO.

Now I am looking for a way to connect it end 2 end so that user from Okta got successful SAML SSO and on successful login is redirected to tenant KeyCloak via OIDC.

I am looking for advise or hint on how to do it or what features to use. Unlikely there are instructions for it but if you know them and could share I would be extremely grateful