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Simply, yes, it can be done. Is it cost effective? I doubt it. A welder or machine shop than can do aluminum will charge $100/hr with either .5 or 1 hr minimum. For $15 you can go to home depot, buy some stainless or aluminum bracketry, epoxy, and bolts and you are done, minus drilling two holes.
I've seen their info-mercials on TV. It seems to be a sort of solder used for repairing/attaching aluminum. Apparently, all you need is a standard propane torch to work it. I spent about a minute on the web researching it, and from what I understand it is effective. You need clean parts (no contaminants or the bond will be poor), and have to seal the weld if it will be exposed to corrosive aluminum. I don't work with this kind of stuff, so I can't really comment. But I figured I would throw this option on the table in case it's of any use.