[brazen1]

Yes, to everything you asked except your GPU.  The 1030 2GB is not strong enough for UHD x265 rips but is probably sufficient for everything else.  I don't think it meets the minimum requirements for subscription streaming such as Netflix HDR either.  For flawless playback of anything, I recommend a 4GB or higher model beginning with inexpensive GTX 960 ( I use) or GTX 1050Ti (positive feedback).  I would also consider full size dual fan models but it is not a requirement.  Also be prepared to use W8 or W10 with or without Creators Updates (I use the latest Fall Creators Update, FCU). 

Hi brazen1

Thanks a lot for all your work and dedication to help and share.

Is there a way to have Kodi displaying an menu to chose which of the external players defined should be invoked?
The idea is to be able to choose something like 2D playback for an 3D mkv. 

 Yes, press C or bring up the context menu from your remote.  Select 'Play Using' and a list of the players will show.
All players have a configuration for using 3D and for automatically selecting the preferred method of 3D formats.  If you don't want to watch a 3D format using a players preferred method, change it to off.  This works fine for a 3D Frame Packed MVC iso for example.  I don't know what you're going to do with a 3DSBS.mkv for example?  It's probably going to show two side by side images.  This is yet another reason I use Full Frame Packed rips in an iso.  Maybe someone else knows how to play a 3D.mkv in 2D simply.  I don't.  A quick google search led me to this though https://play3d-2d.blogspot.nl/2014/02/3d...layer.html but I didn't try it as I have no use for 3D in 2D personally.