Vipassana on arupa worlds
In the arupa worlds you cannot hear the Dhamma as you do not have this faculty, also the mental process is too subtle making it not possible to meditate on it. But if you have experiences even the 1st state of sainthood you can progress from here to the final goal. 


  By the way, living in an arupa world would imply in my understanding that it is possible the arising of a mind consciousness (manovinnana) without a physical sense base (such as our heart base or hadaya-vatthu): is this assumption correct?


My thinking is also that the heart base does not have a physical associated location in the arupa realm as there is nothing physical or corporeal here.

In addition, in the brahma world as you quoted you to not have physical sensation relating to the elements but sensations are present in the arupa cittas. See 121 cittas in Abhidhamma.