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Updating our plugin development status, we are on track to release updates to the OIDC plugins relatively soon, as we finish some code cleanup workthis week. Those plugins are expected to will be compatible with V5.0, not withstanding that support for that ended with the V5.1 release. We will likely be dropping an updated alpha release of the WebAuthn plugin relatively soon.
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We will put together a new page outlining more of the concrete considerations around migrating away from that approach, mostly for use by federations needing help crafting advice for their members. In a nutshell, you need to know what profiles your IdP supports, which ones are in use, and what services relying on that port might support or not support in terms of SAML metadata to allow a smooth migration away from it. In the meantime, the SecurityAndNetworking topic contains good information about why the additional port is largely a historical footnote at this point.