How to programmatically insert Plant 3D catalog parts into a drawing using C# API?

I’m working on automating the insertion of parts from a custom Plant 3D catalog into project drawings using a C# plugin.

What I have so far:

• A custom catalog (.pspx, .acat, .pspc) with supports and other components.

• I can retrieve the desired part from the catalog as a SpecPart using SpecManager and SpecPartReader.

The problem:

• Methods like InsertCustomGeometryPlaceHolderInModel, InsertPlaceHolderInModel, and InsertPlaceHolderInModelWhileRouting require a block name.

• The block name is only generated after the part is inserted, which creates a circular dependency:
  I need the block name to insert the part, but the block name only exists after insertion.

Goal:

• Insert a part from the catalog into the Plant 3D drawing automatically, using the SpecPart (or PartSizeProperties) without requiring prior manual placement.

What I’ve Tried

Here’s an example of what I tried using InsertPlaceHolderInModel:

using Autodesk.ProcessPower.Piping;
using Autodesk.ProcessPower.Specification;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;

public void TryInsertPlaceholder()
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;

    SpecManager specManager = SpecManager.GetSpecManager();
    SpecPart specPart = specManager.FindPart("MySpec", "PART_CODE");

    // Attempt to insert placeholder
    PnP3dPlaceholderUtil.InsertCustomGeometryPlaceHolderInModel(
        specPart.Name,
        "BLOCK_NAME", // <-- Problem: This name only exists after insertion
        specPart.PartType,
        familyID,  // Get it from specPart.PropNames
        specPart.NominalDiameter,
        "",        // Tag is usualy empty
        sizeProps,
        portProperties
    );

    doc.Editor.WriteMessage($"\nResult: {result.Status}");
}

Questions

1. Is there a way to use the SpecPart I already have and finish the automated insertion into the project?
2. If not, what are the recommended approaches for automated insertion from a catalog into Plant 3D drawings?
3. Is PipingObjectAdder.Add(PartSizeProperties) the correct method for this? If yes, can someone provide a working example?