Meet Josephine Savage, French Muggleborn Auror. She was stationed in England during the First Wizarding War and due to her *~connections~* with a certain REL, her most beloved brother Manech was brutally murdered. She's spent the last 10 years picking up the pieces and doing contract work for the French Auror department.
Well, since England is in the process of going pear-shaped another time, she's back. So, she's not only providing assistance to the DMLE but quietly reporting to the continent and keeping them apprised of the escalating shenanigans. Just in case, you know. Nobody wants that crazy nanny-state business coming over the Channel.
Jo's rep from the first war will be as an incredibly competent auror and a barbaric duellist. She also didn't fuck with subnationals - even the Order - and thought they got in the way of justice. Now, even though she feels similarly, she's been tasked with giving aide to any group that brings peace back to England. And to her? It's as long as they're right and just to all.