Both lemon and peppermint extract are over 80% alcohol and should work fine making tincture the old fashioned way of soaking over a period of time. I have no idea how either would respond to cooking via the Master Wu technique.
A one ounce bottle of either extract cost a little over $2, add 1.5-2 grams of reefer and then wait for 4-6 weeks and find out. I plan to give it a try next time I restock.