Always remember, no matter how expensive your screen is, there are people in the world creating better images on cheaper screens.
Tools don't make the tradesman.
You said your computer had a wifi connection problem ... but then you said you'd tried solutions that didn't involve your computer.
I really think you should buy a cheap wifi dongle.
Like this: https://www.amazon.com/Wireless-USB-WiFi-Adapter-PC/dp/B093FT3H7L/
The V850 can do all sizes of negatives.
So you should definitely get the scanner, and do the test yourself. Find a few print/negative pairs, and scan both, and see which give the better results.