Are you injecting Intel? You may be able to get by with semi supported Intel graphics. Try combinations of Intel fake ID and Ig platform ID. Fake IDs 0x04128086, 0x04168086, 0x04028086,and Ig 0d220003, 0d230001, or other random numbers. Try with and without injecting Intel.
I have a pentium g3258 Haswell, and am able to get default Azul framebuffers loaded but no accelerators. I connect to monitor using VGA cable and after boot it drops out and only RX 480 has screen in menu. There is no screen attached to the Intel. If I use hdmi cable to Intel it shows up. The vga drops out because I set GUI monitor settings to 1080 in clover.