I agree with @DW81 - it's your car, so do what makes YOU happy.
And as long as you're not trying to pass your car off as something that it isn't (which I don't think you are) who cares what other people think.
Go for it.
Albeit a couple of years back, I had the timing belt kit AND a water pump fitted for just over £500 inc VAT. The water pump was £80-odd plus VAT on it's own, so taking that into account, plus the labour to fit it, we're talking around £300 for the timing belt kit.
Should you get nowhere with Audi, the parts are not expensive - the labour is the big kicker. Be prepared for a main dealer to want many hundreds of your hard-earned pounds to replace the condenser.
For a fraction a reputable independent will do a perfectly good job.
Audi being Audi, I'd guess that it isn't a separate part. That'd be way too easy for the owner.
I suspect that you're looking at a new air bag cover or very careful repaint.
Someone on here will know for certain.