How about buying a new warranty then 'discovering' all these issues?
This would be my route too.
I forgot about extending my warranty by a couple of days and the price doubled. I rang VW Finance and asked if I could still get it for original price.
"spoke to manager" and success.
On another note, I've had VW contact me regarding my PCP final payment looking at re-financing it even though I have a year left!
They offered 2 years warranty & 2 free services so I think I'll be looking for the same deal next year hopefully then pay it off immediately.