Borbin the 🐱

A Tilt lens changes the focal plane, and this is impossible to do with transforms in Software¹. Hardware is required.
Getting a Tilt lens for Nikon Z leaves you with only a few choices.

Use Nikon F mount Tilt-Shift lenses with the FTZ adapter:

• Nikon PC NIKKOR 19mm f/4E ED Tilt-Shift Lens $3,396
• Nikon PC-E NIKKOR 24mm f/3.5D ED Tilt-Shift Lens $2,196
• Nikon PC-E Micro-NIKKOR 45mm f/2.8D ED Tilt-Shift Lens $2,046
• Nikon PC-E Micro-NIKKOR 85mm f/2.8D Tilt-Shift Lens $1,976
• Samyang 24mm f/3.5 ED AS UMC Tilt-Shift Lens $669

Nikon has not released any Tilt-Shift lenses for Z yet, so you are currently left with only:

• TTArtisan Tilt 50mm f/1.4 Lens $199
• TTArtisan 100mm f/2.8 Tilt-Shift Macro Lens $389

The 50mm is not the best quality with its standard double-Gauss design, and who needs a 100mm Tilt lens?

The idea is to use an F-to-Z Tilt adapter and your favorite F-mount lens (the image circle of a Tilt-Shift lens is larger, but here it is used with a DX sensor, so this is an advantage; I cannot check for FX).
The popular NYC store does not have such an adapter, but the Kipon company store has one: Tilt Adapter for Nikon F Mount Lens on Nikon Z Mirrorless Camera.
The site lists the item as shipping within 1 business day, but as I learned from customer service, it is first shipped from somewhere in China to another warehouse, and then from there to the customer. This translates to a 2-3 week shipping time.

The alternative is to use a Sony E-to-Z mount Tilt adapter, or a Fujifilm X-to-Z mount Tilt adapter with an additional lens adapter as the 16mm flange distance of the Z mount is a bit shorter than the Sony (18mm) or Fujifilm (17.7mm) one².

The Kipon F to Z mount Tilt adapter arrived:

It feels solid and high quality. Tilting is smooth and has enough friction to hold a lens even without using the lock.

The adapter has a max Tilt of 12° and can be rotated 360° with 30° click stops. The smaller plunger on the right side unlocks the click stops during rotation.

For the test, a Voigtländer 58mm f/1.4 SL lens was used:

It really works.

Shelf without Tilt:

Shelf with max Tilt:

Shelf from an angle without Tilt:

Shelf from an angle with max Tilt:

Examples with max Tilt:

The Shift feature of Tilt-Shift lenses is of little interest, as the projection is only a geometric transform in post-processing. The panorama tools easily take care of this with vertical control points (t2). You can never align the lens that perfectly.