jenkst,
First of all, Welcome to Graybeard Outdoors!
No, I haven't considered using a grease fitting, but would love to hear more about this idea. What is the thread pattern on them, 1/4-28"? Probably not that easy.
If you could elaborate a little more on your idea, or show a pic, that would be great? Any and all ideas on this matter are welcomed by me. We will figure something out.