Hey, I guess you better dont keep hopes coz last time I was coming to Doha, they said its strictly not allowed to let go excess baggage or they loose their jobs. So only if you are a real charmer and can convince them then go ahead with or forget it. I contacted a local cargo agent who couriered my cargo at a rate which is 1/4 of what they charge at airport.

BETTER BE SAFE THAN SORRY
HAVE A SAFE TRIP