Hi quick sketch attached which hopefully will get you thinking on non standard options to avail of the triple aspect and views. The bed is centred on the West facing window, so even though there isn't symmetry in the rest of the room, balance is created, focused on the bed. I've shown a freestanding headboard behind the bed - something along these lines....there are design options available which means no need for a bedside locker to the side. I've stolen a small amount of space from the adjacent bedroom (sorry kids!) & pushed the entrance door back into the hall slightly. There is no door to ensuite, but the curved wall which becomes part of the shower creates an entrance & cuts of what you don't want to see (the wc) but allows light in, views out to and from the North. This curve also creates a natural line to change floor covering - say from carpet to tile. Theres approx 5m of wardrobe tucked under the eaves with curved ends (if budget will allow!) and also His & Hers drawer sets either side of entrance door.

Basic design packages don’t allow you to draw in sloped ceilings. So I think you need to enlist a designer or concept planner who can create the room in CAD and help you visualise the space including the ceilings. Try a search on Houzz for professionals. OnePlan is a regular contributor, you can look on her profile to see her past projects, and a quick message to her will start a conversation about different levels of service.

I think I might have misread the poll when voting. I say get the plumbers dirty boots on the carpet you intend to skip not the new one

If you can extend to 7m its definitely worth extending to maximise the space. A good way to do layouts is cut out little templates of a toilet, sink, shower/tub, king-size bed etc then you will be able to work out how much space you will need to achieve what you are hoping for.