On the ios inscript hindi devanagari keyboard how do I type a र्‍ or "verama" character? As in the title this character half ra: र्‍ is used in words in Nepali such as पर्‍यो 

From what I read this is formed by typing "ra" र + "halant" ् + "zero width non joiner" + "ya" य

I do not know how to type a zero width non joiner character in iOS, I am using the standard iOS hindi keyboard.
Just hold down the र key and you should get a popup menu with the eyelash version to select.