Check out how @OpenSecret works. But there would certainly be a degree of trust due to how Apple structures their “Secure Enclave”, but in my opinion it’s a far less trade off than asking normies to deal with raw keys safely. And honestly people learn stuff when they get burned. Let them get burned in a way that actually matters and where there is actually a sovereign alternative. Trade offs across the board are an order of magnitude better, imo, and it drops the barrier to entry by 99% for the overwhelming majority of users.