@Matt_Hartley this starts to become an interesting thread in my opinion. We at least need a new option in the bios that is somewhere in the middle of 0.5GB and 16 GB 
To add some more hints while thinking about things.
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With the iGPU’s VRAM locked to just 0.5 GB via that BIOS reservation, I’m getting wild glitches - imagine random, colorful 30×30-pixel blocks all over the screen (no screenshot, sorry) and some random flickering.
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i maybe got more screen real estate hooked up than usual, so that tiny reserved VRAM gets crushed trying to drive everything
xrandr relevant lines
Screen 0: minimum 16 x 16, current 7680 x 1440, maximum 32767 x 32767
DP-2 connected primary 5120x1440+0+0 (normal left inverted right x axis y axis) 1190mm x 340mm
5120x1440 69.95*+
DP-3 connected 2560x1440+5120+0 (normal left inverted right x axis y axis) 600mm x 340mm
2560x1440 59.91*+
https://knowledgebase.frame.work/en_us/expansion-card-functionality-on-framework-laptop-13-amd-ryzen-ai-300-series-Hy5SfMRs1l
one display on USB-C [port 3] -> DisplayPort
the other on big hub USB-C [port 1] -> HUB -> HDMI