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If I had to do it static at compile time my choice would be to have a Create xxx vi for every class that needs to be creatable. I don't like the class constant on the diagram at all.
If you have a specific structure for your chambers (ie everybody is under the "Hooovahh Chamber" directory), you could do a simple lookup and use the Get LV Class Default Value to dynamically load the classes. I do something similar with my HAL already, except I dictate what class to load based on a JSON file.
You should contact the developer. It may use features not available in earlier versions and it is a source control nightmare maintaining subtly difference versions.
New in LabVIEW 2020:
C:\Program Files (x86)\National Instruments\LabVIEW 2020\vi.lib\picture\PNG\Draw Flattened Blended Pixmap.vi
I didn't create this one. It is not in the palettes. I have asked that it be added in a future version.