[keycloak-dev] Keycloak : Multi-tenant : Login screen theming.

Hello, Please - can somebody help me?! I have been evaluating Keycloak with the intention of providing SSO in a multi-tenant SAAS system. We intend that each tenant will have a dedicated realm, and 'Login User Experience' for each tenant must be cooperate customised. I have sussed from online sources that using innate Keycloak 'theming' will not help me to achieve this? I have also been advised not to use Login SPI as it is regarded as an internal software interface, and consequently subject to change in future Keycloak releases. I would be really grateful for a suggested legitimate approach of how to achieve this in Keycloak, I am a supporter of Keycloak, I can see the potential, and I really want to involve it within our SAAS solution. Thanks in advance, Stephen Merchant Developer Gandlake Limited Crown Commercial Service Supplier BSI ISO/IEC 27001 certification number IS 585161 Gandlake Limited, a Limited Liability Company registered in England and Wales under number 4667925. Registered Office: Gandlake House, London Road, Newbury, Berkshire. RG14 1LA. VAT Registration Number 809 7164 11