Moved to NCM feature requests although this is a very special request. We will discuss in PM team.
The reason why NPM and NCM licenses are different is that NPM is sized acc. to elements (e.g. interfaces) whereas NCM acc. to nodes. On average, we consider a ratio of 5 elements per node but I can tell you that many customers have even higher ratio between their NPM and NCM license size. (No wonder, a switch has 24, 48 etc. interfaces.)