It is a difficult situation
I know Wharrams face the similar issues, you either have a perilously open cockpit, or situate a pod centrally on the deck, sometimes seen with a small cuddy for the watch. Boatsmith's Florida built Wharram went for a more open but well appointed command station protected around its sides and with wheelsteer. A permanent hardtop added more protection on what is a quite large boat it was a suitably large position.

I think its important to have protection from the elements like sun rain and cold and to avoid the risk being washed over the side should a wave break over the deck in rough seas. The issue specific to the proa is being able to have a good all round vision at the same time.

So its either a central pod high enough to see over the coach-house and large enough to catch a nap in, or be straddled on the weather side of the coach-house much like Lagoon 440 bridge. The problem with the Lagoon variant is that a clumsy implementation interrupts all round vision from inside the cabin, and all of it adds weight, even if it is in the right place.

On Lagoons 440 they seem to succeed on the former by organising the windows to be able to view under the bridge, and the latter shares the support and therefore some of the weight of the aft end of the cabin. Visibility is superb with a commanding view but it is quite exposed up there and cops breaking water off the bows in force 8 even on the condo like 440.