You will not get much feedback posting in cm because this is primarily a US site. Either convert your drawing to inches so folks here don't have to do the math, or you may want to post on another part of Houzz particular to the country you live in.

It looks like you want to remove all of the walls on your first floor. Have you spoken with an engineer or someone else knowledgable to determine if they are load bearing and can be removed?

I have always lived with small kitchens and loved cooking elaborate meals. It is a juggling trick for sure!

Here's the drawing with the kitchen dimensions converted to inches. I didn't think the measurements would be as critical right now, since I'm looking for a conceptual plan to start making a proper plan off of.

All the walls can be removed. We'll be adding in a beam to account for the load bearing wall.

My problem right now isn't even that the kitchen is small, it's the fact that it's set up in a really disfuctional way. As much as I would love to, I'll never be able to have a big kitchen in this house. I just need to make the best use of the space I have.

Edit: Didn't realize I could get IKEA to show simplified measurements:

Where is the column going? Too far for a reasonable single beam.

Which wall is bearing, as that beam will probably not be able to be flush. So the beam will demarcate spaces on each side of it.

A new kitchen, opening walls, adding structural framing, and redoing floors is an expensive endeavor. So with that in mind, what is the chance of moving the 1/2 flight basement stair over next to the upstairs flight to make the Kitchen design more pure?

Also, most people who bring split houses here will do any sort of contortion in order to get a powder room on the main level. Is that amenity in your future?

No column, there is very little loading on the loadbearing wall. The beam will either go on the right side of the stairs, or will line up with where the wall between the dining and living room are. Ideally I'd prefer it to be alined with the stair wall, but I need to get that figured out still once we have a final floor plan.

I've considered relocating the stairs to downstairs, but that would be significantly more costly, as it would impact our upstairs (right now we have a bulkhead in our closet where the stairs are for the headroom) and downstairs layout.

And as much as I would love a powder room, there's now way it could fit on this floor, so that's not a consideration.

The beam location is going to be placed based on what is above. A bearing wall means you have a stick built roof, so the ceiling joists will lap each other and that join is where the beam goes. The roof slope will probably dictate that the beam cannot be flush (hidden up in the ceiling), so that means it will hang below and split the room visually.

As far as what "significant" means in terms of cost, wood and drywall (and reusing the stair flight) is relatively cheap compared to counters and cabinets. That is why I framed it as when spending, say, $80K-$150K, adding another say $5K-$8K is minimal if you get a really good layout out of it so you don't regret compromises later after spending the $80K-$150K.

If you're talking about major structural changes, maybe consider swapping the kitchen and dining room. You'll have to move plumbing but you won't have your kitchen layout disrupted by stairs to the playroom. Right now your kitchen is essentially a giant hallway connecting other parts of the house. It's much easier to manage when the all roads end at the kitchen rather than the kitchen being the road to everywhere.

Would you consider moving the Dining Room entry?

I think something like this would give you slightly more space b/w the sink and the range though DW would still be close to the corner. Island is on casters.