Rahul is more solid player at no. 4 in T20s. Though we have a packed middle order, I would like to see him bat down the order opening up the space for both Pant and Pandey or Mandeep. There is a news that Pant had impressed Kumble during net practice and is most likely to get his debut match with added advantage of Left-Right had combination.
Even Virat can open the batting where he looked very dangerous in IPL. We have so many opening options. My ideal lineup will be:

Manish Pandey/Pant/Virat/Rahul

Rishab Pant/Rahul/Virat

Virat Kohli

Yuvraj Singh

MS Dhoni

Suresh Raina (He can play the role of Kedar Jadav in his absence as he is over his prime)

Hardik Pandya

Yuzvender Chahal

Ashish Nehra

Jasprit Bumrah

Bhuvneshwar Kumar