I have a 'spare axel ' in the truck of the car. I might have to try it. Getting grease in there should be easy. Clean out the old with brake cleaner or CV cleaner. I an thinking a shiringe or such. I have a bearing packer from NAPA that has a shiringe to pressure grease into a bearing. I plan to use RedLine CV-2 synthetic grease. Just have to get the oil filler spout of the right size. I'll try some dishwashing soap, thinned a bit with water.
Tom