In Apple's press release[1], they mention proposing something similar to what you're talking about.

"Given the serious risks to users, Apple designed a solution called Trusted System Agent — an intermediary that would allow virtual assistants to safely access the same features and capabilities as Siri AI for devices in the EU."

The European Commission rejected it.

1 https://www.apple.com/newsroom/2026/06/due-to-dma-siri-ai-de...