Easy peasy, just did the same in DEL last weekend. You collect your bags, walk thru customs, then turn left (not right as suggested by the signage) and take the elevator up. The checkpoint on the left is always empty, because everyone turns right as signposted.

Your papers will get checked by CISF twice, once at the elevator, once when you enter the checkin desk area. Then look carefully: there is a general checkin desk bank for AI, a carefully hidden side for *G and First/Executive passengers, and 2-3 desks for 'baggage drop'. You can use the latter to drop off your bags. The line is pretty short there too.