BIG-IP IdP and RemoteUser

Requirements:

• one F5-SP to connect to an external IDP(not hosted by us)
• one F5-IDP to do RemoteUser (similar to https://wiki.shibboleth.net/confluence/display/SHIB2/IdPAuthRemoteUser) and get authentication data from external IDP
• several F5-SP to connect to the same F5-IDP

I want to do the metadata exchange with our external IDP only once, and reuse this SP with all our hosted services. How to implement this? I know it can be done with shibboleth but it would be great to do this all with f5