Even though the sthaaee-antaraa tradition became a fashion in the late forties, it would be wrong to say taht it never happened in the 30s. Listen to jaavo 2 ai mere saadhoo by K C Dey from Pooran Bhagat (1933) here
http://hindi-films-songs.com/khawar-063.html
annd you find him repeating the refrain after every verse. Still there are no interludes.
