Update: I received confirmation from Thomas Knowles (IBM Product Manager) that the Autodesk BIM Viewer Plugin is supported on MAS 9.2.
That answers my main question. The latest plugin package can be used with MAS 9.2, even though the package itself is named for MAS 9.1.
I'll continue with the installation and document the process. If I come across anything noteworthy, I'll post an update here.