If you open up a KBN file (Which is an exported keybinding file) from your %userprofile%\AppData\Roaming\Cakewalk\SONAR Platinum folder with your favourite text editor and add the following in the [Bindings] section:
Kx00600B=874
Kx00610B=865
Kx00620B=866
Kx00630B=867
Kx00640B=868
Kx00650B=869
Kx00660B=870
Kx00670B=871
Kx00680B=872
Kx00690B=873
This will map CTRL num 0 to 9 to the 10 screensets. CTRL 1 to 9 will be screenset 1 to 9 respectively and CTRL num 0 will be mapped to screenset 10
Of course, make sure numlock is on
This works as of 2017.3 but I cannot guarantee that this will continue to work for future updates.
If you are going to work on a KBN file, make sure you have a backup of the original. Also make sure you export your current key mappings to a KBN file so you can revert if need be.
Hope this helps a little.