Excluding Points using Polygon Centre with FacetDome

Hi,

I am quite new to this plugin (less than a month) so inevitably, I have come across an obstacle and require some help.

I am trying to create voronoi sphere with an open side and two details along the Z axis (where the surface of the sphere intesects with the Z axis). At these two points I am trying to create a solid contact point where I can add some fuctional details (small, less than 5x5mm area).

There are two things I have been trying:

1. Exclude the points on the Z axis from 'Polygon Centre' command, so they may appear as solid areas instead of a hole being added in later in the commands.

2. Ensure that the two points become vertices on the 'FacetDome' command, so later in the command chain, they become solid areas and not holes in the mesh.

The first option is preferabe for me for strutural purposes, so if anyone can help me with that or the second, it would be much appreciated!

Thanks in advance for your help.

William