Hi Stefan and thanks a lot for your kind help.
Much appreciated :)

But...as you can guess... I've many years behind me...and I've already tried almost all the most popular 3D renderings engines, including Marmorset.
None of them gave me the chance to easily do what I want to do in this period of my "CG" Life :)
That is, totally get rid of retopo/UVing and render just the bare meshes as they are.

I've already tried, for some weeks, some time ago, the workflow with vertex painted objects imported into both Blender and Marmorset.
But most of the times without any advantage compated to the fast workflow entirely done within 3D-Coat.

If using these additional tool (like Marmorset) doesn't give so much better resulting, for fast concept renderings I much prefer to remain into 3D-Coat.

Its "voxel-Shader-pbr render" its still the best for me now.

Some time ago I have been also one of the first public beta tester of "Instant Light" a very promising realtime
Photorealistic renderer but It seems that actually its developing has stopped.

But one thing I can do is certainly dive more deeply into the very good and powerful Blender's Cycles because it can give the ability to achieve very good result also with procedurale material on "bare" objects, without any retopo/UV.

That's why some days ago I purchased a copy of https://www.cyclesmaterialvault.com/volume-1-materials

I have to dive a little bit into it to see what I can do...

Have a nice day :)

Marco (mkdm)