Even new this could work.If open box in on the table (didn't think so cause he said nothing used), Best Buy has this for $500:
Acer Switch 3 12.2" 2-in-1 Laptop (Intel Pentium N4200/64GB eMMC/4GB RAM/Win10) - Open Box | Best Buy CanadaPortability and productivity in total harmony. The Acer Switch 3 12.2" convertible laptop is powered by an Intel Pentium N4200 processor and 4GB of RAM. It features a full-size snap-on keyboard and u-frame kickstand to support optimal angles for typing for viewing. It has dual cameras and offers...www.bestbuy.ca
I think it ticks all the boxes. Just not sure if a N4200 will be fast enough to playback high-resolution videos.