Using both Material 3 and material components in Compose within the same theme

MaterialConversions.kt

// conversions based on https://material.io/blog/migrating-material-3, deprecated colors set to Colors.Red
@Composable
fun fromMaterial3Theme(isLight: Boolean): Colors {
    val scheme = MaterialTheme.colorScheme
    return Colors(
        primary = scheme.primary,
        primaryVariant = Color.Red,
        secondary = scheme.secondary,
        secondaryVariant = Color.Red,
        background = scheme.background,
        surface = scheme.surface,
        error = scheme.error,
        onPrimary = scheme.onPrimary,
        onSecondary = scheme.onSecondary,
        onBackground = scheme.onBackground,
        onSurface = scheme.onSurface,
        onError = scheme.onError,
        isLight = isLight
    )
}

@Composable
fun fromMaterial3Theme(): Typography {
    val typography = MaterialTheme.typography
    return Typography(
        h1 = typography.displaySmall,
        h2 = typography.headlineLarge,
        h3 = typography.headlineMedium,
        h4 = typography.headlineSmall,
        h5 = typography.titleLarge,
        subtitle1 = typography.titleMedium,
        subtitle2 = typography.titleSmall,
        body1 = typography.bodyLarge,
        body2 = typography.bodyMedium,
        caption = typography.bodySmall,
        button = typography.labelLarge,
        overline = typography.labelMedium
    )
}

@Composable
fun MaterialBridgeTheme(
    colorScheme: ColorScheme,
    typography: androidx.compose.material3.Typography,
    isDark: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit
) {
    MaterialTheme(colorScheme = colorScheme, typography = typography) {
        androidx.compose.material.MaterialTheme(
            colors = fromMaterial3Theme(isLight = !isDark),
            typography = fromMaterial3Theme(),
            content = content
        )
    }
}

Theme.kt

@Composable
fun MyAppTheme(
    content: @Composable () -> Unit
) {
    // normal Material 3 theme setup, determine light or dark by whatever means
    val colors = if (isSystemInDarkTheme()) DarkThemeColors else LightThemeColors

    MaterialBridgeTheme(
        colorScheme = colors,
        typography = MyTypography,
        content = content
    )
}