Let them, we've seen how this played out in US, a disaster. Navy must have the capabilities to maintain its own high value vessels. Smaller ships like coast guard corvettes, OPVs etc can be argued upon, but anything bigger than a frigate should be left to the navy.
To move the point, Reis Class like any other submarine we currently operate only have 533mm torpedo tubes. 533mm is a tad small for long range cruise missiles. AFAIK, there are no cruise missiles launched from 533mm tubes in any NATO country. Israel handled this with 4 additional purpose built 650mm tubes next to the 6 533mm tubes and is theorized to use them for the nuclear capable Popeye Turbo missiles. But it is also claimed that even Israel is moving to VLS equipped boats with the last Dolphin 2 Class Drakon, which have a much larger sail.
A Gezgin that is fit to made into 533mm tubes would have to be smaller in diameter and there already are length limits. It basically would have to be a lesser performance munition. I would go as far to claim that a Gezgin designed to fit into a 533mm tube would be drastically different in size and performance next to a VLS one, you can basically call them two different missiles. You can even the first one "Gezgin 0.50"
MdCN fits to the 533mm torpedo tube as far as i know, and Tomahawk also fits within a 533mm tube, but not the torpedo tube itself. A vertically packed tube that can be replenished at shore, not through hatches within the submarine.
There are two matters from the perspective i see it;
- Since we are fitting a long range cruise missile, entire of 533mm needs to be utilized and this gets a capsule discarded. Without a capsule now our missile has to endure all hydrodynamics and launching loads, and transition from water to air with ease and deploy the fins/canards and do this all safely with a well controlled CoG and forces.
- Length of missile, lack of shrouds for installing, on board equipment may indicate that a Gezgin may not be loaded into a torpedo tube from within the submarine and has to be reloaded at shore, therefore if the submarine is destined for such a role at least few tubes will be occupied by Gezgin, pre-loaded. Either torpedo tube gets taller to accomodate the missile or the missile / booster gets shorter. Recently we have heard that Gür class submarine's torpedo tube has lengtheneded to accomodate Akya torpedo, but i believe this wasn't the sole reason.
- A forgotten point: Also design of the missile, shroud may affect the swim out methodology, whether it will swim out by its own propulsion or pushed by pneumatic systems or a mechanical system. Setting a safe distance to turn on the rocket booster to emerge from water etc. Without a capsule these all becomes a challenge.
Atmaca is fitted into a torpedo tube through a capsule. Imo this is a necessity in 21st century to provide a decent swim-out distance and flexibility in engagement. This is not necessary when your missile can reach 1000 km+ distances.
So a torpedo tube and vertical tube launched versions may share similarities but at least the booster design length and/or missile length may need to be varied. Or its canards and nose will be different from the air / surface launched versions to operate both in submerged swim speed and in flight speed.