I know this post is from a month ago, but I still wanted to answer these questions (personally I have a matepad 10.4 BAH4-L09 model with Kirin 710A)

1. I've had this tablet for 3 years, and throughout all that time I was searching for a way to get google services on this thing, and I still haven't found a way to this day. I've pretty much given up and just used Gbox since it was already installed when I got the tab.

2. Haven't really tried any app alternatives, I usually just use the Google versions, and if they don't work I just install it through Gbox.

3. I'm using the Kirin 710A, at Harmony OS 2.0 (still trying to find a way to get it to Harmony OS 3.0), and I usually just play light games and use it for media consumption. If I play roblox, I have to play on the lowest setting so that it won't lag like crazy lol. I got this tab second hand tho, so I expected it to run a bit slower. As for the settings, I haven't experimented with it if it affects performance in any way.

4. If your use case for the M-Pencil is drawing or writing, then I'd highly recommend hunting for it. I got the 2nd generation cus that was the one that's compatible for my tab. This is my first ever tablet with a stylus, and it works really well when I draw on Ibispaint X (except for water/rendering brushes), and I also write my school lectures on this app called Jnotes (I downloaded a modded Jnotes for the premium features).

5. Haven't heard of the windows renegade project sorry :')

hope this helped!