Hey @BloodyYxX,
that's an option, too, of course - once you added the game to your account and the region is applied correctly, you can then log back in via Origin and download the game from there.
You may also wanna check Origin, hover over your username in the bottom left corner, choose "EA Account and Billing" and then "Security" in the browser window that opens. If you scroll all the way down, you should see trusted devices and locations you've been logging in from - for some reason the IP seems to be IP location might be picked up incorrectly.
If you wanted to get another router anyway, feel free to do so. If not, maybe resetting the one you have can help, when you say there's a lot of rules and restrictions. Might be a bit of work to set it up from scratch, but still would save you the hassle of getting a new one.