"While the Kaby Lake-G architecture is rather old at this point, the Radeon RX Vega M GH is roughly on par with the performance of an NVIDIA GeForce GTX 1070 Max-Q."
Not sure how you got to that conclusion, Vega M GH is somewhere between the old 1050 and 1050 Ti.
The Hystou F9 has brought back Intel Kaby Lake-G processors. The mini-PC is available in numerous configurations and can drive four external monitors across using DisplayPort and HDMI.