Nemrod, WOW! they way you set up your dome never occurred to me. But those are a lot of hoops to jump through. If I stay with Inon would mean just buying a whole other set. Have to start seeing if there is a good +144 Degree dome option out there for the Sony.
Not a hoop, a plastic bag?
It is not difficult. You could fly to Arizona, in the winter, when the humidity is zero. Since I only take it apart once year, it matters not. But, I think you are sticking on the two pice thing, you realize that most of the wet dome lenses including the Inon UFL165AD and the FIX UWL-04 and UWL-28 and all that I know of are actually two piece lenses (I know this because I take everything I own apart to see how it works--everything!). The Inon 165AD is a 105AD with a plastic dome added. You do not take those apart, why confuse yourself with the Inon domed kit lens. Just put it together and leave it alone. And yes, no matter what 144 plus degree lens you purchase it will have a dome and you will need another lens without a dome for those 90 degree lens shots. Either way, you will need two lenses. The acrylic domed lenses will not shoot as well as the glass Inon, they will flare and ghost when the Inon will not. Of course, any lens will flare/ghost if you insist on pointing it badly into bright light.I also know this because I own an example of all of them. Missing from the photo is the Inon UFL105AD and my new(er) FIXUWL52-28, but you get the picture (pun):
Why stop there with only 144 degrees, my Inon 165AD will shoot nearer 165 degrees:
Had I bought two years later or so, when the Sony came out I definitely would have gotten it. But, I plan to shoot my FIX90 until it dies and it is in the shop now being rebuilt and I have three cameras for it. But when it goes or I sell it off, I am not going to settle for less than a shutter that shoots NOW and I would not want to go down to a measly 144 degree DFOV,
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Edit: Let me clarify something for the OP, once the Inon dome kit is assembled to the host lens, there is no further need to EVER disassemble the lens except in the possible need of service due to damage. You can consider it as a single unit from thereon just as any of the other dome equipped wet lenses on the market.
Thanks for the tips and the inspiration and good luck in your search for a wide angle lens that suits you, I think you already have it
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N