I 3D printed a part that would fit around the PCIE riser and would stabilize the GPU.
It took a few tries to get it all as i wanted;
V1 - needed some heat to melt the GPU through the holes i made where normally the GPU holds into the rear of the case. and the pillar to screw it in place was not aligned correctly.
V2 - was a lot better but the Riser kept coming loose; the release tab on the motherboard would get pushed down when pushing the riser down (releasing it again)
V3 - Everything now fit, but the pillar broke when i screwed in a screw to secure the GPU.
V4 - Instead of a pillar, i made a wall and lowered it so it's still possible to reach the I/O ports.
V3
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GPU Holder
V4
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V4