Don't know where you "read" ANY of that into my post. I stated....

Bonnevilles don't have drag links like Mike'* photo shows. They are FWD.
GXP'* don't use greaseable fittings.
Most modern air powered grease guns have one multipoint swiveling end that doesn't require different attachment ends.
That I grease my truck twice a year.
And for the cost of a simple job that can be done wrong easily, do it yourself.

Grease slowly seeps out the cups, and you should only replace it till cup is expanded again. You should not blow grease out of the cups. The only thing your going to accomplish is breaking the seal, splitting the cup, and allow moisture in.