There are two ways to reach
One is by flight from Jodhpur to Saradar Vallabhbhai Patel airport from where by cab or bus or self drive 7hrs you are in Kumbhalgarh.
second is via train to Ahmedabad then bus to udaipur, and then cab to Kumbalgarh.
Coming to reaching Chittorgarh
If you take a cab from Kumbalgarh it is 4hrs journey.
If you prefer train it is 5hrs from Udaipur, where to reach udaipur you have to take a cab from Kumbalgarh.
I will share a few offbeat things to do, in Jaisalmer see if it is suitable for your travel.
You can try a temple trail
visiting Khoodhi sunset at the desert
Desert national park to witness great Indian bustard
Try to enrol for dune bashing and quad biking
Touching border Longewala
Tasting huge glass of Bhang lassi.
Happy journey.