IKEA do some tall cupboards which are 37cm deep rather than the ~60cm depth of a full counter, which would fit behind your window.
Or you could also have a built in dead space there, perhaps fill with something like this unit all the way up: https://www.ikea.com/gb/en/p/tornviken-open-cabinet-off-white-20358970/
We have an L shaped tiny kitchen with no possibility to put anything on the third or fourth walls - the third wall has no sockets and a large window, and the fourth wall is a weird diagonal door. I designed it myself with Ikea's tools and we built it ourselves, this is the layout (to the far left of the picture is a fridge-freezer, full height, about 60cm wide). It it tight, you can't comfortably have two people doing their own thing at once, but I am pleased with it.
We have cupboards on top because I don't like open shelving in the kitchen, we don't clean often enough and I find things get dusty and grimy. There should be an extractor fan fitted, but Ikea didn't have the right cupboard in stock, and my idea to just stick a longer door on didn't work due to the position of the hinges, so it's a work in progress. I would like to do some tiling or cover the rest of the backsplash because I think it's too much white at the moment. We do have a few different countertop "gadgets" as you can see - but we went for a smaller sink and this has been fine, the only issue is that I went for a 10L/min flow tap and if you put it up to full speed and it hits anything other than the bottom of the sink, it sprays everywhere. But this is easily avoided. We don't have a draining board, and don't miss it. If we wash something up by hand (rare) we just dry it immediately. The corner bit of the counter is where we keep our kettle and toaster. Under UK law, I think the plug sockets here would be too close to the sink so be careful with that (they are fine here apparently, we are in Germany).
The furthest away unit on the longer counter side is a freestanding dishwasher. IKEA's system would not let me put a dishwasher, or an empty cabinet here, but I did and it works fine. I used some shower curtain rods to support the end of the longer counter! It does mean that you can't open the under-sink cupboard while the dishwasher is open - we keep the dishwasher tablets in the thinner cupboard between DW and oven instead.
We do have a drawer unit temporarily on the opposite wall, and there is a bit of dead space between the fridge and short counter end, which we use to store a fold up chair and folding set of steps (to access the top of the cupboards/let DC help with cooking).
Note that Ikea don't have UK standard size cabinets - their cabinets are 40cm, 60cm, and 80cm wide (which is 2x40 when done with doors) and UK ones are wider than 40 but narrower than 60, I'm not sure the exact width.
What was really helpful was when I'd mocked up the design I wanted, I took the diagram with me to the Ikea showroom and I looked at all their mocked up kitchens, being very familiar with the cabinet sizes by this point, so I could judge it easily enough, and I found a combination where the sink, stove, high sided cabinet or fridge and corners were as close as I could get to my design, and stood in it and pretended to cook to get a feel for the space. That helped a lot with spacing the long side.