I squeak. I have poly bushes all round on the front. even the ARB is poly. It still squeaks like an old morris marina. I used half a tub of copperslip putting the bushes in, greased everything else with high temperature grease and 3 months later its doing it again. I'm getting fed up with stupid little things that annoy me on the car now.
I agree that a grease nipple would be great, but getting it into the bush/sleeve interface may be tricky. I even devised a greased sleeve for the godforsaken bolt on the rear suspension that needs persuading with a sledge hammer.
Bloody italian cars.