BSB-GAYA-PNBE-HWH would never be a feasible option due to extra time required. 1 day return would never be possible, 2 rakes would be required and won't be preferred by end to end passengers at all. Rather if 2 rakes are going to be used them it would be much better to run a HWH-PNBE VB with a schedule of 6 hrs or under and a HWH-BSB VB via GAYA with a schedule of 8-8.5 hrs.