I do this! After the first year's tea turned the beer too bitter for my liking. Tincture all the way! Everyone liked year 2 over year 1 at Christmas Eve! I used roughly 4oz of my extract.
I just used a Vermont Grade B Organic. Looking on Amazon, Id use any grade that isnt grocery store regular just bc u dont know how the various preservatives etc will affect the beer.
I really like this idea, and plan to leave the coffee beans out of the mason jar due to everyone's concerns. Do you boil the bourbon to eliminate the alcohol prior to putting everything in the mason jar?