It could be time to revisit this topic. I have Keyshot Pro for IronCAD, but have nothing but trouble with the live link crashing IC, updates ruining materials in Keyshot etc. I recently installed blender 2.9, purchased a .STP importer add on and have found that I can replicate any keyshot look by using Keyshots HDRI's and overall its a much more capable program with a much faster GPU renderer in Eevee.
Would be happy to pay for a live update ability with IC/Blender