Hi,
1. Last time I tried - the easy to use Android TV Netflix App does not work
at all any more with WeTek devices. The muich harder to use touchscreen/tablet (1080p) Netflix App needs and Air mouse remote.
2. The 1GB RAM in the WeTek Hub really is too small for a snappy Marshmallow 6.x.x - Android TV device - there are significant slowdowns.
Plus Firmware is no longer supported, and that is really important.
2a The Mi Box BT remote still works when using LibreELEC and CoreELEC Leia. However it does not survive a dual boot, and has to be painfully repaired again.
3. Not that I know of. There is the USB dongle Wireless remote in the MECOOL link below.
If you are in the USA - the Best budget Android TV device currently on the market that works quite nicely indeed is the Android TV Oreo 8.1 -
Jetstream 4K Ultra HD (click) - which does 4K Android TV Netflix. It's also properly Google Certified.
The new Oreo 8.1 Mi Box S might be alright if Xiaomi can come out with decent Firmware - but be really really cautious with that one and wait for proper reviews.
Otherwise a bunch of people at the budget end of the market have been buying the snappy, stable (Nougat 7.1.2)
MECOOL M8S Pro L (click) - which only does 1080p Android TV Netflix but does dual boot to LibreELEC / CoreELEC.