Since Gwalior has now gifted with 12319/20 Agra Kolkata Express, I Think Gwalior Howrah Chambal Express can be easily extended upto Jaipur.
12176 --- Jaipur (2340) Bandikui (0140/0145) Alwar (0225/0230) Mathura (0450/0500) Agra (0535/0540) Gwalior (0735/0740)
12175 --- Gwalior (1650/1652) Agra (1835/1840) Mathura (1915/1925) Alwar (2200/2205) Bandikui (2250/2252) Jaipur (0100)