If you read the posts from fosterbojangles on Whirlpool
https://forums.whirlpool.net.au/archive/2192653
he had success with his 2015 Evo Cross by just replacing the rear wheel with a US spec one.
http://whrl.pl/Red24G
Even though Electric Cyclery has them listed on their website you will find it hard to source a US spec wheel now as the dealers are reluctant to sell them to OS customers.
(Link Removed - No Longer Exists)
It will also probably cost US$750+ to have one delivered if you can actually find an obliging dealer.
I'm not sure what the secondhand market is like in Sweden but an alternative would be to upgrade to a 2017+ Evo Cross. You get a more efficient 48v system and a higher 500wh battery capacity. The other advantage is that the EN15194 eBikes can be unrestricted through a simple software setting. A friendly dealer can do this for you or if you are adventurous you can follow the instructions of Nasrudin2468 who successfully reverse engineered the config and provides detailed instructions on how to build the necessary cable and run the software he wrote to patch the config.
You can follow his steps here
http://whrl.pl/ReTpex
Note: this method only works with 2017+ Evo's with the newer M179 motors.