This device misses some of the requirements for GrapheneOS. It wouldn't be as secure as a Pixel.

Just get a Pixel with GrapheneOS and put one of ZitaoTech's USB-C BB keyboards under it (or get a BT one).

It's a MediaTek SoC, so the Linux experience will be Bad to say the least. This thing will be running the oldest kernel possible with all kind of nasty vendor hacks.