You're welcome

With coronal incision they cut away a strip of scalp skin, and they use all available follicles from that for hair transplant. How much is dependent on your hair density.. but its often enough to fill the corners (corners doesn't have to be neccessarily thick) and maybe use what is left for elsewhere.
If you need any hairline lowering in the front, this doesn't do it. Frontal hairline needs to be thick, and this means LOT of hairtransplant to achieve the natural looking density. I have seen enough poor attempts to achieve hairline lowering with hairtransplant, to be suspicious about results. It's also important to keep in mind that coronal incision approach removes hairline back for another 2-4 mm.
I think your price estimate might be a little exaggerated... Marbella is expensive but it's not Aspen...
And NOONE knows where the eur-usd rate will be in one year, let alone two years, which can make a lot of difference.
$31,000 would be about right for medical costs (if you would include hairtransplant) +
$2,000 for two round trip flight tickets (+ or - depends on you) +
$2,000 for stay, food, taxi, etc (or more, depending on your preferences)
You would be looking at around $35,000 by eur-usd rate as it is today.