Welcome to the Club Roger. From what you have said you have covered most of the points you need to be concerned about. Others on here who own an NX will be able to give you further information.
Pan roofs mean it is not advisable to fit roof bars is the consensus - not impossible but with many caveats.
Car registered after 1st April 2017, which have a list price over £40,000, mean you have to pay extra road tax for the first five years after registration. Others on here may correct me.
Interior trims seam to be mainly black so you may have to hunt a different colour down.
Colin Barber has some old price lists that I am sure he would share with you if that helps. I have attached 2016/17 price lists originally from Colin.
Regarding the CVT box - they do not run on rubber bands! They are different from an ordinary auto box but as you describe yourself as a steady driver, I think you will find the seamless gear changes a delight - the test drive for a whole day will confirm if you like it.
I am sure others will be along to add more than I can. The NX would appear to be very reliable with no major issues throughout the range.
Good luck with your search.