You could always fit a central lubrication system.They used to be fashionable as accessories to ancient cart-sprung monstrosities, which had greased shackle pins as well as track rod ends etc, and I seem to remember that in the late 1950s Halfords still had some of the bits. Basically there is a central pump, which might be operated by something like the clutch pedal, so it gets a stroke every so often, without the driver having to think about it, and a hydraulic distributor, which selects one nipple at a time (if they are all plumbed in parallel, all the flow will go to the path of least resistance, leaving all other joints dry). Flexible lines, our friends Goodridge would oblige, go to all the moving parts, fixed pipework, probably Kunifer, elsewhere. Similar systems are used on steam locos, with drive from the piston crosshead, through a reduction gear, to give one squirt for so many revs of the wheels, the distributor advancing one position each time. The model engineering magazines still have adverts for scaled down versions, which might suit a small car like a Mini. Our friends M-Machine are also into steam locos, and perhaps they would be interested in manufacturing such a system if there was sufficient interest?
I would suggest using EP140 oil instead of grease in such a system, giving attention to the sealing arrangements, and I often wonder just how much it could extend the life of the ball joints and radius arm bearings. You would use banjo fittings to connect to the radius arm nipple holes. Nowadays, you could activate it with a small electric motor, with a timer, or maybe from the speedo drive, a squirt every so many miles.