If anyone's interested, my bodge seems to have worked ok. The issue I had is that the rubber mount around the bearing had perished and torn, so the drive shaft was hanging down, knocking against the bearing housing. The bearing itself still span and seemed ok. So what I did was get the car up on ramps, get under and position the drive shaft centrally using some baling wire to take the weight, cleaned the whole area with isoprone alcohol wipes, and then put tape around one side of the bearing housing, and then injected, against the tape, sikaflex using a sealant gun, basically using the sikaflex to replace the existing mounts. I made use the sealant didn't overspread onto the drive shaft itself, and left it for 48 hours to cure.
And now it seems absolutely fine. Sikaflex is super strong, but has a little give, so I think it might do the job as a semi permanent fix, and I'll happily spend a fiver to try save 500..... Little panda has 70k on it now and is still going strong, but I don't want to spend a packet on it...