Font with part or all Javascript?

I am a newbie to font development and need some help.

I have a need to have a font where part of it needs to be in javascript. Actually one letter only, is there a possibility to put javascript letter within a font? Though if technically it is not possible with only 1 letter then a total javascript font. Thus is a total font in javascript possible?

This letter क on the posting, is it in javascript, can the k/K on a font be removed and this क javascript be put instead? This will allow users to type with this javascript on text editors or wordprocessors that allow javascript any internet content that can then be copy/pasted.