thats a shame it didnt help... could you send the crashed out skyline logs with the dx11 trick... just want to make sure it isnt just a gl issue.
on the contrary, even though the card may be slow... according to specs on it, it has the necessary requirements to run skyline.
Support DX11 11.2 and opengl 4.4.
The shader errors are a possible cause of an older card not supporting the modern shader features.
From what i am getting, you are able to render something, but when its something specific it fails...
To really help show what problem you are facing, would you be able to record a video of boot to crash, and then post the applicable logs after. This would give us the best ability to help fix your problem

Again, thank you for your patience and we will do everything we can to help you.