Part of the problem here is that in order to 'Rectify' spirits, one needs a particular license, right? And if you have that license, you can't sell what you make directly to someone in a drink - You'd need to sell it to a bar who'd then be allowed to mix it into a cocktail. So, silly question: Can a bar have someone (An employee or pseudo-employee, I guess?) get the license, whip up the infusions and then 'Sell' them to the bar? (I use sell loosely here. Presumably precisely at cost). I'm not a lawyer, but if the rectifier's license isn't too hard to get, that could be a temporary solution. At least until the laws get changed to something sensible in 20 or 30 years...