No disrespect intended as this is just a mere observation in general of the symptoms and the following advice given pertaining to MAF issues.... Sometimes we have to get things off our chest and sometimes there is no easy way of putting it... So....
What makes you think the MAF is beyond the point of no return?
Why waist (and you will, read further down for explanation)
£100+ on replacing when you can actually try cleaning it first to see if that works? A £5 aerosol tin of Isopropyl alcohol cleening fluid is a hell of a lot cheaper than a Bosch MAF
Then there is the often missed "common sense"
Why did the MAF failed in the first place?
Have the elements been contaminated so therefore can't read properly within the ECU given parameters?
So what will just replacing it do?
Sure, it will work as good as new... Then......
6 month later you will be posting again about the MAF with the exact same symptoms.
It is a simple process of making sure that the air filter is clean, free of leaks and no bypass of unfiltered air present, usually down to the lid housing and rusted screws/ broken lugs etc...
To summarise for anyone who just doesn't "get it!"
No bypass of dirty unfiltered air, clean MAF sensor = No problem
Dirty unfiltered air, contaminated MAF sensor = problem
I give up... I really do