An LHB Duronto with CC ~ SL-8, 3A-5, 2A-3, H-1 will be great on the days when 22203/4 isn't there, to tap the demand.
Very practical as it needs only 1 LHB rake & 22203/4 can be independently upgraded to LHB at a later date.
PS: RJY, KZJ halts can considered if Cost/Benefit is good.