Open the Gaussian Blur Menu programmatically

As is already known, various modules in Corel 2019 and larger no longer work in VBA and C#.
Now I would like to open the menu Gaussian Blur.
Idea 1:
The following key combination should be opened with a button (cmd+c --> cmd+b --> cmd+Space --> cmd+g).
Unfortunately I have no idea how to do this.
Idea 2:
If I knew the command ID of this function it could be opened with this ID.

Has anyone ever tried to solve this?