I hear you Bev but I have used sedum and semps in the mail box designs and at the edge of the driveway beds for years.
It could be because I have always used the old Sedum that have been in the trade for years is the reason I have never had a problem. Some of the old ones if you put gasoline on them and set them on fire you could not kill them.
The new and brighter different colors may not be as tough to handle the salt and snow like the old varieties. I will take cuttings. I do have 2 other succulent cactus beds that will not be in the way of salt.
We were posting at the same time. Valley do you mean Cherry Tart you said Cherry Frost?