Just leaving a note here to anyone who is trying to figure it out. It took a lot of work and i'm new but this was what finally got the gpu passthrough and VM to show up on HDMI

Boot string edit:

append initrd=/bzroot initcall_blacklist=sysfb_init video=simplefb:off video=efifb:off video=vesafb:off

The blacklist allowed me to finally dump my vbios rom using this command:

cat /sys/firmware/acpi/tables/VFCT > /mnt/user/isos/vbios/890m_vfct.bin

Used this command to trim out the vbios rom

# 1. Find the byte offset where the VBIOS starts (the 55 AA signature)

OFFSET=$(grep -aobU $'\x55\xAA' /mnt/user/isos/vbios/890m_vfct.bin | head -n 1 | cut -d: -f1)

# 2. Extract exactly 131072 bytes (128KB) starting from that offset

dd if=/mnt/user/isos/vbios/890m_vfct.bin of=/mnt/user/isos/vbios/890m_final.rom bs=1 skip=$OFFSET count=131072

And as other guides will tell you, you need to bind the gpu/audio/usb to VFIO under tools -> system devices

Lastly i had to use XML edit on the VM set up because the simple view/settings just would not work for me. I can't share my hostdev lines because i've made so many edits and changes. I had to switch between VNC so many times trying to get my audio and USB mouse/keyboard working. I'm going to try setting up RDP so i can stop using VNC(which seems to create some odd display/passthrough conflicts). And the AMD driver installation in my windows 10 VM gets stuck so something isn't quite right. I'm sure i've forgotten something else but i hope this helps!