G'day, Have fixed broken switches several times and it can be done.
The 3 switches are all in an assembly held to the steering stem with two screws and are meant to be replaced as an assembly, expensive and hard to get. The trick is to pick up cheap spare ones, even if one switch is broken, for parts.
Complicating matters, the switches are not all identical between years and models and were sourced from at least two, probably more different manufacturers but the mounting base is similar as is the size and overall function of the switches and i have successfully grafted switches of one type into the assembly of another but it may take some creative thinking, cutting, araldite etc.
Each switch can be dissembled individually, some have screws holding the cover on, others metal rivets. The rivets can be carefully drilled and driven out and replaced either by pop rivets (use small washers behind to stop the rivet pulling through the softish plastic) or with screws/nuts.
Watch out for the internal springs, pull covers off slowly and be sure to note the placement of everything.
The problem you will probably find with yours is that the metal stalk is bonded to a plastic block inside which holds the copper switch contacts, springs, pivot, etc. The plastic section will almost certainly be broken and difficult or impossible to glue so you are looking at finding a replacement but if you can find an assembly with a broken blinker of wiper switch it may well provide the parts you need and will be muuuch cheaper than a good assembly.
Moral to this story, dont throw any assemblies away!
One thing to keep in mind if replacing assemblies is that the switch for the later models with intermittent wiper is a little larger than the earlier ones and the plastic surround covering the steering stem on the early models wont quite screw together properly (although it will work) and will have a small gap showing so it is a good idea to get the surround as well if upgrading to the intermittent system.

im pretty sure only the plastic block is broken, the lights were working perfectly before hand, although i dont know if any collatoral damage has been done now.

will open it up tomorrow and have a crack at fixing it, although i hope it doesnt mean i stuff something up that I cant get the car to spetacollo!

Anyone know how tricky it is to get the assembly off, and whether dismantling it is overly difficult to get to the plastic block?

THanks Rob,

I swaped the combination for a second hand job, $100 from Milano and that seems ok, except the highbeam function wont stay on (when stalk and pushed down into place) Im not sure but i assume that the switch must be buggered. Ill open up the one i just pulled out of the car and replace the switch in the new (second hand) one i just put in. I think all the wiring is right as the highbeams come on when i hold the stalk towards the steering wheel