I think matt of the vivas came up with an excellent solution to getting the arb refitted:
This was how i did it on mine, when i changed all the bushes.
Bolt Antiroll bar to subframe first on one side only. Then remove the bolt that holds the drag link to the lower arm on that side, loosen the large nut that holds the drag strut to the subframe and you will be able to fit the anti roll bar link to the drag strut easily on that side. Refit the drag strut to the lower arm on that side - should still be easy as there is not much tension yet.
Next refit the anti roll bar clamp to the subframe on the other side and repeat the process of removing the lower arm to drag strut bolt and loosening the large nut, so the drag stut can be connected to the anti roll bar link with ease. Now the difficult part - pulling the drag stut with anti roll bar link attached back into the correct place so it can be bolted back to the lower arm. This is the solution:
This is an ordinary spring compressor, hooked round the subframe and anti roll bar link. It can be tensioned perfectly so it pulls the drag strut into just the right position to simply drop the bolt into the lower arm. This all sounds a faff, but honestly its easy, and does not involve straining or levering. Once i had figured it out, it took me about ten minutes to refit the anti roll bar, which up until that point had defeated me for most of a morning...
Good luck
Matt.