What you want to create is a .mc6 or a material collection that is specific to the model but includes all material zones. That is your 1-click option to the MATpose file. The approach is similar to creating a.MT5 except you click on the Material Collection radio button, click the Select Materials pill button below it, and make sure that all the material zones are check-marked on including Preview. Click OK, double-check that you have given the collection a name, and click OK again. This is assuming that the model has all its material zones pre-populated with nodes and textures.

If you only have one type of material for all the zones, simply click on the contextual menu and select Apply to all.., then create a Material Collection for that specific model.