Blender OSL Shader for connecting LabPBR inputs to Principled BSDF. It's not perfect, but provides a decent starting point for viewing LabPBR textures within Blender or other renderers supporting the Open Shading Language.
Note
Using 'closest' instead of 'linear' sampling may improve the performance of lower resolution textures, though this is more of a stylistic choice.
Warning
Make sure your texture inputs for normal and specular are set to 'Non-Color' or 'Raw'.
Gold Ore from the AVPBR resource pack rendered a 128x subdivision on a cube mesh.