Trying to come up with a way to open this without "well, actually..."

Godot UI components are keyboard accessible by default and do support Arabic. I haven't tested them with a screen reader so I have no data there.

The Godot editor itself is made in Godot, and it doesn't feel particularly snappy when compared to vscode, so I agree with the general premise that it wouldn't be a huge step forward. That said, it is more accessible out of the box than you might expect.