Globally Fix Font Size for System Fonts in iOS 14+

Question

I want to use system fonts in my SwiftUI text, but these fonts automatically scale with the user's accessibility settings.

Text("abc").font(.system(size: 12))

Non-system fonts have this fixedSize initializer which allows it to not adjust to user settings, but there's no equivalent version for system fonts.

Text("abc").font(.custom("Arial", fixedSize: 12))

Another answer on here proposes using the environment to fix the font size, but unfortunately this doesn't apply to sheets. (This might be a bug similar to the one with environment objects not being passed into sheets). So I have to add this line for every view that is presented modally, plus the root view of my app.

var body: some View {
    VStack {
        ...
    }
    .environment(\.sizeCategory, .large)
}

Is there a more elegant way to globally fix the font sizes for my app, rather than setting the environment key for every possible view that could be presented modally?