If that bar really is 1.2kg, I'm sorry to say that you'll have no chance getting that in the weight limit. If you're modifying the bar, however, that might prove viable...

And the two motors you've chosen have an amp draw of 20A-ish each, which means 40A. Your battery will only supply 32.5 if my calculations are correct, so you might want to get a higher discharge rate battery if you're going this route. Probably a higher capacity too, I'd say - maybe 1500-2000mAh would be better.