Excellent post. I would doubt there are even 2000. In my decades of life in the South, I have met ... drum roll please ... ONE (1) person that claimed membership. Conversly, a young black man I worked with said the reason he migrated from yankeedom to the South was to escape the Klan.
fwiw, i was NOT impressed with his accent, his BIG mouth and/or his "brains"!
free dixie,sw