Margomar - life seems to be full of these tough decisions as we get older and this is one of the worst so my heart goes out to you. As a priority, get the vet to your house. The vet will have the records of your dog's CKD and meds and will know the background, and will be able to assess whether he's in pain. If he answer is yes, he is in pain, you don't really have a choice - you have to let him go and that could happen there and then in the comfort and familiarity of his own home. Of course, there's the selfish choice (to keep him alive to give hubby longer with him) but I know you wouldn't make that.
If the vet says he's not in pain you simply put your cards on the table with your husband and tell him you need help to relieve you of your share of the cleaning up. That might mean he stops going out to do his own thing or that he employs a dog sitter with experience of old dogs and who's not squeamish. The dog urinates maybe once a day in the house, and defecates much less often in the house. If your husband steps up himself and also provides a substitute for you, everybody's happy. Incidentally, the dog will not like making a mess so he should have genuine attention and love whenever it happens. Also, the writing's on the wall and the decision will have to be faced eventually.