In terms of actual euro brands they seem very light on 27.5 bikes – most are 29er. Radon have the ZR team but it looks quite budget. YT and Canyon only have 27.5” wheels on the small sized frames – the rear are 29er. Cube and Felt both seem to lack anything either.
If Sonder have stock in the EU already then the Transmitter is pretty good – my mate went from a 2004 Kona Caldera to a Transmitter – it took some adjustment particularly to the slack head angle but he loves it now. Just threw on a 140mm revelation he had and a mosh mash of parts. I reckon if you run 2.6” – 2.8” tyres they’ll give more flex / comfort than the difference between steel and alloy.
Sonder Dial probably also worth a look for a more xc experience than the Transmitter. If you can bring yourself to go 29er then the Sonder Signal Steel could be worth a look.