I have read all of your thorough and insightful comments. Indeed, passengers from DGR do face a lot of hassle particularly 12340/12341 in the office hours, in the morning. Particularly the situation in 12340 is very bad from a DGR passenger point of view, with no reliable HWH bound train to follow, I ignored Mayurakhsi as it's timings at HWH are not particularly favourable for a daily passenger.....
One thing that can be done is extending the 63351/2 to DGR from MON-SAT , then that MEMU rake can be used as a fast MEMU all the way from HWH/SDAH...