This is for the people like me who intend to use their SDRs with their transceiver as one integrated unit. For a long time (from 2008) I have been using a homemade solution for antenna switching and audio path switching. Small but useful improvements were made during these years which were result of obtained experience. Since I am convinced that this is a very useful device I decided to make proper PCBs out of it and to offer it to the ham radio community as a ready product. Go to https://sdrswitch.active-antenna.eu/ for more details.
There are also 2 videos: