"Is there any possibility of a smokeless load in this?"

Your gun should checked out by a gunsmith that understands older guns, before you shoot it with modern loads. But if it checks out, there is no reason not to shoot it, as long as you take reasonable precautions. Obviously, it should not be shoot with heavy magnum waterfowl loads.

I shoot sporting clays with a group called the "Vintagers" and a lot of us shoot these older damascus guns with modern loads. We try to keep the pressures in the 6K-8K range and use light loads - 7/8oz. usually in the 16's. I have even hunted pheasants with my 16's and the 7/8oz loads, and not felt too handicapped. I have a couple of damascus 12's that I shoot sporting clays with. One of them is an old E.M. Reilly side lever hammer gun, with a beautiful damascus barrels, and 2.5" chambers. I have a good 7/8oz, 2.5" load that I use in this gun. I also shoot a Bonehill boxlock with damascus barrels. I shoot Remington 1oz, 7 1/2's or 8's, light field loads through the Bonehill.

"Commission barrels from where, of you don't mind me asking?": well, that is what I do - build double rifle barrels, however, as Ruffcountry pointed out, there are probably issues with getting them to you in Australia. I have not dealt with exporting to Australia, but I have sent a gun back to Africa. In that case, the US was not a problem, since all I did was "repair" a customer's gun and return it to him. Not sure how Australia would look at it.