Ha Ha Ha ....
Certain basic Assumptions :
Frontage of this operations will be 15-20 kms ( five armored regiments) with sufficient flank protection, at least one of the flanks having an independent armored Brigade. (three armoured regiment - Total 10 armoured regiments, if RAPID not employed, otherwise 12 armored regiments).
What have you - maximum five armored regiments and two R&SP battalions including secoral reserves.
Those five regiment would have been decimated by the time three / four thrust lines concentrate around Rahim Yar Khan.
A fire base of 45km in depth and 50-60 km in width by 155 artillery -16-20 artillery regiments, Smerch, Pinaka, BM grad rocket artillery topped with Brahmos and Prahar. Oh boy, who will allow you in that zone.(155 ke gole bade bade hote hain bhai).
Now, you will have to employ ARS - 5-7 armoured regiments to come to Jaisalmer. Firstly forget about using 40 km frontage leading from RYK to jaisalmer through Islamgarh or Tanot-Longewala. It means you will have to go towards Bahawalpur and launch through Bijnot or from Sukkur Daharki - Yaro Lund coming on to Longewala. This will be contested by five armoured regiments besides 12 armoured regiment of main offensive.
By the time you decide on it and launch your operation it would be minimum seven days past the start. By that time Indian forces will be having a bath at Guddu Barrage, having their "chhota pg" on the banks of Sindh, National Highway physically held across Sindh and and ,,,,, Pakistan broken into two parts,.
So that option is not going to work out .... think of something else.
You have no other options....Karachi and Hyderabad will be celebrating Diwali and Chinese boarding their ships at Gwadar with lots of Pakistani begums.