Hello,
for the client side there is a migration guide available:
SNC Product Migration: Now is the time
Then you can migrate the server side step by step. Of cause you need a new SAPGUI on the clients for that, but you can roll out this with the new Secure Login Client and the SNC_LIB_2 enviroment variables.
Maybe this hint helps you for a smooth migration solution.
best regards
Alexander Gimbel