Thanks for the informative article! I realize that this article is almost a year old, but I have a few questions that I'm hoping you can help me with.

I see that you have different instance names for the FCI and the stand-alone instances within the AG. Would it be possible to use the same instance names for all instances? I'm not sure if that would be allowed since all instances are part of the same WSFC.

Would it be possible to use the same drive letters\paths for the data and log files with all instances? This would prevent having issues with things like ALTERing the DATABASE to ADD FILEs on the primary and having it fail due to the drives being different on secondary replicas.

Would application and user connections connect to the AG listener name?

How reliable has this configuration been? Have you run into any unanticipated issues with this setup?

Thanks!!