I suspect it’s just one of those weird cultural foibles. The US isn’t too exceptional among Western countries regarding moderate or binge drinking. It consumes meaningfully less alcohol per capita than Germany, France, Ireland, and the UK among others, on par with Sweden, Finland, and Denmark: https://en.wikipedia.org/wiki/List_of_countries_by_alcohol_consumption_per_capita. US alcoholism rates are about on par with Sweden, France, and Germany, some 25% lower than Ireland or the UK: https://worldpopulationreview.com/country-rankings/alcoholism-by-country
I didn’t thoroughly research those numbers, but they square with my anecdotal experience. Soda is where the serving size really fucks us up.
There is a trend in high end spirit sales in the US to sell 1 or 1.25oz pours, 30 and 38ml respectively. It’s more a cost saving measure, but I do like it. 30ml is enough to try something.
I don’t have a brand I would recommend, but I can say making your own extracts is extremely easy. Roughly chopping hazelnuts, toasting them, and adding them to a neutral vodka or glycerin would take maybe ten minutes and no special equipment. I went through an extract phase a while back and still have several, including a truly kickass coffee vodka.
Making it yourself isn’t fast, but I share your dislike of how hard it is to find unsweetened, reasonably priced extracts. I don’t want syrups, I like being able to control sugar content separate from additional flavors.
I do wonder how it would taste in comparison. I’ve never tasted hazelnut extract vs flavored coffee, creamer, or syrup, only ever in baked goods.