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They dont rust in the cylinder block - its the cylinder head! - and is quite common for injectors to seize solid in the head especially on these vans!..unless your garage has some sort of hydraulic injector removal/puller set , the Pichler set is normally the one you need, its an expensive set unless they do these vans all the time to pay for itself. they are pretty much stuffed, certainly if one breaks in the head without suing the proper tool - either they will need to source around locally for a specialist who has these pullers to come in and do the job for them? there a few online if you google around.. or you'll be looking at another cylinder head,rocker cover and 4 injectors,plus programming of all 4..
Of course you have to damage that to get the head off..no other way round it..sadly!.silly engineering at its best..What id suggest at least before doing anything is to have a look online - and see if they are any injector removal specialists fairly local to you - you could get them to come out an do the job for your garage..i know some actually travel to jobs,garages and do them on the spot..its certainly worth looking into before you start considering going any further on that engine to be honest...