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Combine wine, peach liqueur and peach vodka in a 9x13 inch pan and freeze at least 6 hours or overnight.
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Bring a medium saucepan of water to a boil and make x's in the bottoms of each of the peaches. Place into the boiling water and boil for 2 mins.
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Fill a bowl with ice water and plunge the peaches into the cold water and let stand for 2-3 mins.
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Remove the peels from the peaches with a pairing knife, then halve and remove the pits. Slice into wedges and lay on a plastic wrap lined cookie sheet and freeze.
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Place the frozen peaches and frozen wine mixture (it won't be fully frozen because of the alcohol content) into a blender with the agave syrup.
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Blend until slushy and pour into glasses, garnish and serve.