Due to the request of some fellow Hams, that I met at Ham Radio in Friedrichshafen, you are now able to import your already activated SOTA summits to APRS Caching.
The file needs to fulfill the specification descibed here: http://www.sotadata.org.uk/ActivatorCSVInfo.htm
The easiest way is to grab your activator log from http://www.sotadata.org.uk/ActivatorLog.aspx with the button "Download complete log" and import it on the site https://www.aprscaching.com/m/aprscaching/import