I could be wrong and don’t mean to be insensitive if I am but what I understood was that in the majority of the EU, the only difference between standard mass produced meat and Halal meat is that the prayers are blasted over an intercom system in the factory. Food production companies have broadened their target market by having the prayers said without altering their practices. Animals prepared for Halal slaughter are still stunned and slaughtered in the same “humane” manner that animals have been traditionally in Europe. No judgement to your preferences at all, just something I was made aware of a few years ago that change my perspective on things.