[keycloak-user] Possible to create a SecurityIdentityProviderFactory with custom provider?

I'm running Keycloak 1.9.8.Final. I just want to add another social provider with some custom logic (boilerplate OpenID won't work in my case). I've registered my module that overrides SecurityIdentityProviderFactory and provided my own Provider and Factory classes but get a 'resource not found' when I try and access the provider from the Keycloak UI. I've also tried adding my own LoginProtocolFactory module and I see it get registered on startup but there is no item for it in the 'add provider' identity drop-down..... Is what I'm trying to do just not possible? Or is there something obvious I'm missing outside of registering modules above to get this to work? Regards, Ben