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First, demounting a tire is not a trivial task. It is best performed with the right tools.
As someone pointed out, a minispare (aka donut) and wheel are much lighter than one would think - on the order of a bare fullsized tire - even a worn one.
Third, mounting a tire is also not a trivial task. It's easy to damage the tire rendering the whole point of trying to save weight a moot point.
And while I think fix-a-flat has enough umph to seat a bead, but only enough if the bead is already sealed. The can won't work if the bead is loose.
I think the weight of a cell phone is your best bet - if you are so inclined.
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