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After some tinkering, I finally managed to get the banshee model working. To do this, I combined the SMD file of an archangel and the SMD file of a skeleton. The skeleton SMD file was obtained by first running the GR2 skeleton through GrannyExporter, and then converting the FBX skeleton to SMD. The animation file was also initially run through GrannyExporter, and the FBX animation was also converted to SMD using Noesis. I initially converted the FBX animation to SMD only because 3ds Max 2008 couldn't handle the newer FBX format from GrannyExporter, but I later noticed that this also helps solve the problem of different skeleton sizes in some models.
First, I tried importing these files into 3ds Max 2008, but for some reason, some parts of the banshee's mesh didn't move, specifically most of the cloak pieces. After trying to import the same 2 files into 3ds Max 2018 and 2020, all parts of the mesh started moving correctly, but there was a problem where the mesh started to "tear" in some places. I noticed a similar problem with other models in these versions of 3ds Max; it looks like a bug in the SMD plugin. Then, I tried importing these files into Blender using the SMD plugin, and everything worked without any problems. I've attached all the screenshots in the attachments, and I've also uploaded the files to a drive if anyone is interested in taking a look: https://drive.google.com/drive/u/2/folders/1poy_Uy-2NCJ12dG3vYBZuh9acQEwCGXl