Also this one intrigues me , i found this in a drdo journal long time back.
Note the size of the heavy load (which is the cannisterised article)
If the form factor of the system as depicted in the picture is correct
Then we can see that the dimensions of the cannister round is limited within the articulated frame when compared to other cannister based articles or naked articles all of which extends beyond the articulated arm.
If one were to take cognizance of this , it would possibly imply that work is going on to implement the K-4 into a land based launch system , considering the obvious fact that of all available missile systems of considerable range K-4 is the shortest and most compact of all, due to the simple fact that it has to be accomodated into the limited dimensions of a SSBN silo.
Readers discretion is advised , ain't responsible for accuracy of info