Another quick idea: I always keep a supply of Boil in a Bag, by Minute Rice. The little bags of rice boil up real quick and just the right portion for 2-3 servings. I just spoon out small serving, wrap up the remaining, put it in a ziplock bag and store in the frig till next feeding.
Along the chicken thread, you might also want to try boiling up Chicken livers or gizzards, and give just the broth. Very tasty and has lots of nutrients. Smell is horrible to us humans but it's worth it to see the dogs lap it up when they won't eat anything else. The liver and gizzards are rich, so I save those and cut them up for later and feed them sparingly when the dogs are eating better. Another good soft diet food is to soft scramble up an egg with just a tad of butter. All of these things have worked for me for years with small (Scottie dog) or large (Bernese Mtn Dogs)
Just feed small portions 3-4 times a day. Good luck. I know your heart is aching.