2012-2017 Yaris Radio in a 2007

[Ecefour]

I've wanted Bluetooth in my 2007 yaris. Problem is I find most aftermarket radios totally hideous, but the LE and SE 2012-17 models have a stock radio I like.

I just had a few questions. I know these are really specific questions, but hey! Maybe I'll get lucky and somebody will have an answer.

1. I know the third gen Yaris has 6 speakers while the 2nd gen only has 4. Will this cause any issues?

2. Is there anyway to keep the stock aux port functional on my 07?

3. The third generation comes with hands free phone controls. I believe the mic is located between the dome lights. Is there a factory location to install a mic the second gen Yaris without cutting or drilling?

4. Are there any other problems I should consider before buying a this radio?

Thanks.