Good news (I hope): I remembered that there's a non-proft specialising in fixing stuff near my office, and today their computer guy's there.
So I decided to get a second opinion from a place that *doesn't* want to sell me anything: And hey presto, apparently fixing it should be simple - and only a few hundred bucks!
Decided to leave my laptop there during my vacation, will take one from work for my trip and keep all my extremities crossed that things will turn out okay after all!
@shirasade A few hundred quid for a fan and a bit of RAM still is a lot of money. But changing the RAM involves soldering. One would assume a company that charges 3 grand for a Computer would have the money for a couple of chip sockets. But this being Apple...
@famaniel I say a few hundred, but honestly I don't know - I gave them a max amount of 500, after which they have to contact me, and he said that should be enough. The RAM change is actually really simple, no soldiering in my old MBP involved (I've done it myself in the past). Even the Apple dealer would have charged less than 100 bucks for it.