I'd be surprised if it DID hold. Leverage is on the tanks side here. Use the short handles as the gimmick but leave it so you can get them out. Then get a dowel that will span the entire tank and leave you enough to grab hold of. Then you have a continuous piece.
I strongly doubt that those pipe brackets will work for the weight of the tank. If you are wrong about how well they will work you lose the tank, dump whatever water and substrate you have in it all over the floor, and have a major clean-up job to do, plus possibly paying for water damage. It isn't worth the gamble in my opinion. If you do as GraphicGr8s said, it would be much more likely to work - then it only fails if the dowels break, but I would use steel pipes instead.