Port for Nauticam NA-EM5 Housing

[hezishohat]

Hi
I decide to buy the Olympus OM-D E-M5 with the Nauticam NA-EM5 Housing.
The first lens will be the 12-50 (will add more lens later when I will have the budget. The 60 mm will be the first)

My dilemma is about the port.
Those are the option I saw on the net.

1.Port 65 For Olympus 60mm for 300 $
Can be use for the 12-50 too.
But I will need to add the Nauticam Zoom Gear for Olympus 12-50mm Lens 550 $
And the Nauticam Focus Gear For Olympus 60mm for the manuel focus 170$
The thread is 67 mm so I can add a diopter directly
Totally 1,020$

2. Nauticam 12-50mm port and zoom ring kit 800$
That’s include the zoom gear and I can switch to macro during the dive.
The thread is 77 mm so I need the Nauticam Flip Diopter Holder for M77 Macro Port 260$
But I can add any 77 to 67 thread

my question is about manuel focus with the 60mm in this port
will I be able to do it or I need the Nauticam Focus Gear For Olympus 60mm here too?

3. Nauticam 4" Wide Angle Port for Olympus 9-18mm 480$
This one fit the 12-50, 60 and 9-18mm
But not sure if there is a zoom gear for the 12-50 with port or if you can attach a diopter.

Thanks, Hezi Shohat