Flying any of these kind of planes comes with a huge amount of drawbacks due to the weight, drag and lack of speed in general.
That is why they would need some special arrangement for their implementation in AH.
AKA: "no enemy icons, except for other seaplanes".
Otherwise these would simply be flying targets without a hope, and as well it would make a case for their purpose as air sea rescue of downed pilots to retain perks + streaks.