I know of nothing that can read the HD models right. My guess is the changes made to tell them to read the HD textures broke things. The good news is that SD model from the GC and Wii are 99% the same as the HD but a slice of bad news first. Switch Toolbox can NOT read SD models with bones right as well. It will delete all weights of the model and bones are all messed up but you can get SD models with Blender and a plug in that keeps the model intact most of the time.
Use Dolphin to extract out the .arc from a GC or Wii .iso (SD and HD use the same file names and structure so don't worry about being lost) You can use Switch Toolbox to extract the GC/Wii .bmd models. Load the GC/Wii .arc in Switch Toolbox. Than find the model you want. Right click on it and use Archive than Export as Raw Data. This should save you a .bmd file.
Now you will need Blender 2.79 or 2.78 and the BMD importer for Blender by niacdoial. (Think there is a 3dMax plug-in around as well.) If you got the BMD import plug in set up right it will extract the SD textures from the .bmd file on import into Blender. Than save the model as a .dae or other format. Now just swap out the SD textures for HD textures. a
Use Dolphin to extract out the .arc from a GC or Wii .iso (SD and HD use the same file names and structure so don't worry about being lost) You can use Switch Toolbox to extract the GC/Wii .bmd models. Load the GC/Wii .arc in Switch Toolbox. Than find the model you want. Right click on it and use Archive than Export as Raw Data. This should save you a .bmd file.
Now you will need Blender 2.79 or 2.78 and the BMD importer for Blender by niacdoial. (Think there is a 3dMax plug-in around as well.) If you got the BMD import plug in set up right it will extract the SD textures from the .bmd file on import into Blender. Than save the model as a .dae or other format. Now just swap out the SD textures for HD textures. a