I brewed a 1.090 doppelbock 5 weeks ago, using WLP810 San Francisco lager yeast, and after three weeks of no activity, I have concluded that it is stuck at 1.032. I would like to get it down another 4-6 points if I could.
Nine days ago, I brewed a 1.052 pilsner, and split the batch between WLP833 German Bock and WLP940 Mexican lager yeast. Both are in a temperature controlled freezer set at 50°F. The 833 is still chugging away, but the 940 is done.
I also have available a half gallon (growler full) of unfermented bock wort. I grabbed it the day after I brewed, from the bit under the false bottom. My thought is to boil up that half gallon of wort to ensure it is sanitized, adding a pint of water to knock the gravity down from 1.090 so it wouldn't shock the yeast. Then I would rack the pils, aerate the wort, then add it to the now empty primary with 940 yeast cake. After a day, when it gets back to high krausen, I would add that to the stuck beer and swirl that in gently, in hopes to restart.
I am welcome to suggestions to improve my proposed plan.