Back supported Navigation-View

Is there any convenient way to back deploy the NavigationStack or NavigationSplitView??

The real problem is if I want to back support iOS 15 or 14, I must conditionally switch between NavigationView and NavigationStack / NavigationSplitView.

Here is how I did for NavigationStack, but I have no idea how to deal with NavigationSplitView

import SwiftUI

struct NavigationStack<Content: View>: View {
    var content: () -> Content

    var body: some View {
        if #available(iOS 16.0, macOS 13.0, *) {
            SwiftUI.NavigationStack {
                content()
            }
        } else {
            NavigationView {
                content()
            }.navigationViewStyle(.stack)
        }
    }
}

Will the new NavigationStack and NavigationSplitView back support old devices? I think these behaviors in previous OS is not new features.