So happy to have finally resolved the issues with the .NET dialogs so I can continue moving forward with modern, interface-rich, agile software development.
Here's a screen capture of the Paving Model Selector source code at the beginning stages of development. This new dialog, called from the Profile Generator user-interface("UI") displays a list of all available paving model files in the ASE project data folder. Selection of any of the listed model files will change the generated profile in the current drawing to that of the selected paving model. This eliminates the need to create a new drawing and set it up for a different alignment.
The biggest advantage though is the ability to change alignments on a generated profile drawing at will, without the need to create a new drawing and attach it to the current ASE project, then select a paving model to assign to it.
(New)Paving Model Selector Dialog
I'm still working hard to get the next update out asap...