Deck & cockpit drains - through hull reduction plan

[Mitch C]

I'm a new owner of a Moody 54 and looking to reduce the ludicrous amount (16!!) of through hulls!!!
All 4 deck drains and the two cockpit drain go to separate through hulls/seacocks. The port deck drains are via the fridge/freezer heat exchangers so unless I change to keel cooler plates, I can't quickly/cheaply do much about those.
For the other four (deck drains and cockpit drains), is there any reason why I can't convert them to above the water line skin fittings?
Other option is to keep one of the through hulls, but manifold the drains together. This might bring up a possible volume/capacity through the manifold sea cock if things get a bit lively on deck....

Appreciate any comments (good or bad) on the above plan.

Thanks in advance