Hi All
Having nursed our multi with a clutch with a low biting point since we bought it in 2010, I have recently had to replace it.
I did the same as you, after the gear change got unbearable/ impossible, I bled the clutch, exactly as described with the 2 bleed nipples, but got a leak where an o ring split on the connection with the slave cylinder. Result was DOT 4 everywhere, no clutch and the orange lights of shame as the RAC dragged it back to my house.
I tried to bleed it again, a complete PITA, but doable without tools, other than a footpump and old bike innertube to push the fluid through the system from the reservoir. Got the clutch working, and then admitted defeat, the clutch had gone, it never slipped but was worn.
After 18 hours work, new clutch fitted and all happy. The old clutch was an original FIAT item, and the previous owner included all paperwork, and had never had it done, so I don't think that 179,000 miles is bad for the original clutch. It now drives like a new car.
I think that if bleeding doesn't fix it, and it changes gear happily when the engines off, then it can only be the clutch itself. On mine the fingers had worn down against the release bearing, which accounted for the low biting point, as the friction plate wasn't that much worn down when compared to the new one.
Sorry for the depressing pre- Christmas news, but as Multipla owners, we're never quite done with repairs!