How to carpet top step internal corner

[turpis]

Hi all, pictures included but this it's unfinished so you'll have to use your imagination a bit, have included some lines to help visualise what I'm talking about

The chipboard you can see here is the 'top step'. The corner indicated with the question mark is bending my brain a bit. The carpet needs to fold over the bullnose on each side of the tread (yet to be routed) and tuck in underneath - have tried to illustrate this with the other marks. But I can't make sense of how to carpet that corner without there being a gap underneath. The geometry seems to make it impossible. I think this must be a fairly common situation so hopefully someone knows the trick? Thanks.

 

[Tigercubrider]

II am no carpet fitter, but could you continue the stair run up to the landing?
And wrap the landing down where the RH step is?

Joining the carpet (ideally sewn if possible) on the line of the top landing ?

 

[turpis]

II am no carpet fitter, but could you continue the stair run up to the landing?
And wrap the landing down where the RH step is?

Joining the carpet (ideally sewn if possible) on the line of the top landing ?

Good suggestion and this probably would be easiest but I'm no carpet fitter either so chance of getting an invisible seam is slim to none.. was hoping to hide all the joins in between the treads/risers

 

[Tigercubrider]

Sometimes it’s good to know your strengths, and your weaknesses.
years ago my parents used an old school carpet fitter to move the living room carpet after a house move.
It was an Axminster, so good quality on a woven base and you couldn’t really see a join.

Might be worth asking local fitters for a price?

Are you adding a bullnose ? Makes hiding joins easier.
Only other suggestion if the landing carpet has enough volume

Use a strip of carpet to cover the last riser and wrap around to the short part where the RH mark is.

Cut an L on the landing carpet so it covers the landing and (new) small landing cut so the short part covers the RH stair top and folds down on the short mark, covering the short bullnose and stopping.

The longer part covers the landing and wraps around the bullnose
You’d need to experiment with something to get the angle of the V correct

Theoretically, the weak part would be the point where the 2 bull noses meet - but not subject to traffic?

Hope you can follow it? Hard to explain.
Try it with card or brown paper