Podium/step - with concrete base or plates individually in foundation?

Hi,

I am now considering how to design the exit at the patio door.
At first, I thought of a block step. But due to the given shape, several cuts would be necessary to make it fit. I don’t have the machine for that, and ordering one would be rather expensive for me.
Nevertheless, I will get some quotes again.

Therefore, I am leaning towards simply making the platform out of four slabs (front, two sides, cover).

So far, I have found that two variants are common for this:
1) Create a concrete base and glue the slabs with frost-proof "tile adhesive"
2) Set the slabs individually like curbstones/lawn edging stones in concrete, fill the interior with gravel, sand, or lean concrete, and place the cover on top

Regarding 1), I know of some (older) projects (from the rental era) where the glued slabs fall off after many years of repeated "stepping/driving on them" (by all residents).

Regarding 2), how exactly do I fix the cover properly? Just placing it on top or simply "gluing" it to the standing slabs does not seem durable to me. Possibly then fill the interior with lean concrete and directly fasten the slab with it?

a)
Can you add anything about both variants? Advantages and disadvantages? Is any of this nonsense? Are there other variants (apart from a whole block step)?

Additional questions:
I have not researched this intensively yet, but maybe someone can answer briefly alongside:
b) How are the slabs "jointed" at the points where they touch each other (there should be no visible joint)? Simply outdoor silicone?
c) How is the connection to the house wall or the door "jointed"? Also silicone?

If more info is needed, just ask.

Here is a sketch of the situation, as well as a photo of the current state. I would fill up to the height of the top edge of the paved concrete. This would make the small red step "disappear". On this first concrete base, I could either form a second base, which would then be covered with slabs, or set one or two block steps.

even though there are unfortunately no answers, I at least want to provide the following information.

currently, two options are available:
1)
- set the formwork at half (=20cm) of the two stones standing perpendicular to the house wall, and concrete up to the top edge of the paving. The red step in the door jamb is also covered by this and we get a flat concrete T-shaped surface (see shape in the previously posted sketch bottom right).
- a block step made of concrete in this special shape does not exist and is not cut either, because those from the inside (it is cast concrete) are not nice.
- a block step made of granite in graphite costs €80 locally, the cutting to size costs €70.
- the step is certainly quite heavy, possibly first pave and concrete, then transport over the paving with a roller cart and then apply the 4-man-4-corner principle for the last 10cm.

2)
- pour concrete as in 1) plus additional build-up in T-shape (according to the sketch) also cast in concrete (formwork cast in one piece) (possibly 2cm shorter on all sides).
- ceramic floor coverings/terrace slabs from the catalog to be selected are glued onto this base (a cover, a front, two sides; the cover would protrude 2cm on all sides as a drip edge).
- significantly cheaper at >€30/m².

I think I would find 1) visually best and for durability, 2) might be easier to realize.
I don’t know other advantages and disadvantages yet (nobody says anything).

So far I can't find anyone who wants to cut something like that out of a concrete block or a natural stone block. Most stonemasons only make gravestones... The building materials dealer also can't refer me further. I will ask soon at a nearby construction site, maybe they have a large stone saw there.

It will now be a concrete block, which will be cut to fit at the corners by us ourselves using the stone saw and the angle grinder.

The concrete block is now in place. Now I'm thinking about how to seal the edges. Is simply dark silicone suitable for outdoor use? Here are a few photos of how it looks.