You can still decarb it with the double boiler method.
So you have the alcohol and oil mixture now, to make things easy I would let it evaporate at room temperature and then add the same amount of cold pressed coconut or olive oil and then put it the double boiler.
Be aware that this can be very potent stuff, so when you try it the first time make sure you don’t have anything important to do the next 12 to 24 hours, one dose the size of a grain of rice can get you high all day long.
I decarb my dried bud dry that way, make sure you have the lid on.
You can manipulate the cannabinoids by changing the timespan of the decarbing.
I’ve experimented with it and wrote up my findings here:
Currently I enjoy the 2 hr 10 min. timespan on all my cultivars.