Well done mate but take care that Lapland isn't a tropical region but a arctic one and making so you'll change the environmental feeling of fly and fight in this northern region where most of engagements happen in the noon time or anyway in a limited portion of the day and where you need to keep your eyes at the clock too to avoid a unexpected sunset coming!
Comparing the two worldpos you have wrote above we have in Lapland a 62 vs a Korean 15 decline which mean that the area is far north with a different sun height and moreover about the month you have a 10 (october) vs 6 (june) so another sunrise and sunset settings shifted in Lapland towards the shorter daylight vs a Korean longest daylight!
Instead of change the decline why don't you try to change only the month to 6 only so you'll have the longest arctic daylight and to have the highest sun height (at noon) you need simply to start mission at 12.00!
What I'm doing in my map load.ini before start a mission is to set the correct month , pressure and temperature (I use this site:
http://www.wunderground.com/) and I can fly in the current condition in every maps!
I also keep a record of the condition I used in verious days if I like to change the period....
All the best!
walter