B. K. Jeffery--You CAN reload Berdan-primed brass. People on this forum regularly report that they do it. People of the type who insist on doing something peculiar, putzy, expensive, unnecessary, and difficult, (and requiring extra, hard-to-obtain tools and materials) simply because they want to, or because everybody else says that it can't be done, or because they are just stubborn.
The same kind of individual insists that reloading steel cases is easy, fun, practical, and no extra wear & tear on the machinery nor the operator.
I have relatives like that; I know whereof I speak.
Just because something CAN be done, is no reason in & of itself that it SHOULD be done....
With the $$ from selling the Berdans, you can buy a smaller number of nice new unfired Boxer-primed cases, and then you're in business.