Yes, oil, alcohol, water, whatever I can infuse, I will, dependent on the raw material
I will be doing locally foraged gum weed again this year, in honey. Really incredible for coughs during flu season. My dandelions, yellow dock, horsetail & St John's worth got heat infused into olive oil this afternoon. All will be used in various salves I make, sell & give to anyone in my area needing help.
So you'd be making a tonka bean tincture, basically. That could be used for several products with a little creativity
I'd suggest trying to test out other infusions with your tonka beans as well: oil, raw honey, a simple syrup, real maple syrup, whatever you can. If it was me, I would smash them roughly in a mortar & pestle (size of small chocolate chips, don't powder them in a coffee grinder), then add to whatever liquid I was infusing. Try a cold infusion & a heat infusion, let sit for several months afterward, then compare which gives better results for your uses. I have never worked with them, but am now considering it. I bought several kg of vanilla beans of various types earlier this year & have been making various extracts with them, for food, body care products, soaps etc. The smell & flavour are amazing
Today I strained a wild blackberry & madagacar vanilla bean infusion I did it in raw apple cider vinegar last September, added a tiny bit of natural sweetener after straining & bottled it. Absolutely outstanding flavour & color!
I ended up with about a half gallon, so am giving some as gifts to friends tomorrow. Will be foraging wild blackberries again this year & making several gallons of this stuff as it's very much saleable. Gourmet infused vinegars go for big bucks here, including to chefs in higher end restaurants at local resorts. I also have several friends with local shops who would be interested in selling the various infusions I make
Good luck with your tonka beans. Would love to hear about your results. They sound incredible