Peach liqueur

Measured by weight; no spoon/piece conversion.

Instead of Peach liqueur

No true peach liqueur substitute; these give alcohol and sweetness but not the peach aroma.

Brandy or rum
Use 50–60% of the weight and stir in 1 tsp sugar syrup per 20 ml; stronger and less fruity.
White wine
Use the same weight and add 1 tsp sugar per 50 ml; lower alcohol and more acidic.
Vodka
Use 50% of the weight with sugar syrup and a little mashed peach; neutral but gives alcohol and sweetness.