Ongoing work on the reverse-engineered Panfrost OpenGL ES driver for Arm Mali GPUs has turned the RK3399 SoC into a very attractive platform to try out Wayland on ARM devices.
Founder of Vamrs, ROCK960 manufacturer here, iPad 3/4 display is eDP interface and you can drive with RK3399 directly, you don't need DP and controller board. ROCK960 doesn't export eDP due to the small size, ROCK960 EE version has eDP exported.
Radxa ROCK 3A(Quad A55@2Ghz):
- 35$ for 2GB - 55$ for 4GB - 75$ for 8GB
No wireless but you can use a m.2 wifi/bt card.