I also have a tool to feet the roots for the Brugmansia. Scream if you want me to post it.
I am all ears.
Do you find a longer length on the PVC will be better by providing more water for the plants?
I have done this in strawberry jars in years past. I also drilled holes along the length so all plants could receive ample moisture in the strawberry jar.
Believe in yourself even when no one else will. ~ Sasquatch