Ive used the Christman method since the 80's on 160-40 on RX and TX to start and then on TX only once I got involved with Beverages for RX. It was easy with the TS-930, 940, and 950SD to make near instantaneous switching. The phasing lines back then were built using a home brew noise bridge. I never could understand the benefits of the method using the dummy load to dump power and poor VSWR bandwidth....except it made the seller happy.
I dont understand why the DXE switch is any better than others.
Carl