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needle grease it through the boot but then youll have a hole in the boot for water/dirt get in. id wait for it to wear out and then replace it with grease-able components
If you are extremely adept and clever, it is possible to drill holes in the plug (without any metal shavings getting in), and then adding the fittings.
I wouldn't worry about it now, I would do what I had to do almost a month ago and just replace the ball joints with Moogs. They're greaseable, better than OEM, and carries a lifetime warranty if you get them from Advance Auto.
I'd also do your tie rods while I was down there...