we need a plan with dimensions including the kitchen and any adjoining rooms with original doors and windows to understand the space and what are the walls and floor made out of?

unfortunately i can't read the dimensions..please advise the length and width of the wiw and the original kitchen...my initial thought would be to keep the wiw intact as a private comfortable office and have the pantry in the space where the stove is and have a small entry hall to the master suite but depends on measurements and how much of the kitchen would need to change and what is the U shaped object in the kitchen?

Your plan shows that you already have a study?, Oklouise idea to use the cooktop space for a WIP would be ideal. It's very hard to read any measurements.

Your house has 3 bedrooms a study, living room, plus a rumpus room

I'am guessing from the plan that the entrance is at the top of the stairs?, what size is the internal entrance space and what closes it off from the kitchen and living room, also the rumpus

I think it will be a mistake to use the WIR as a pantry, it's too big , distance between cabinets is too far and do you really want to stand in a cupboard .. Seeing that you work from home the WIR would be far better used for your home office.

You mentioned have already started work and changed things which is a shame as you could have had a better result, ie: access to a narrow WIP should have been at the sink end which would have allowed for a possible narrow office, both running parallel to each other, with both having light from the external window

Just a general idea,

another version of siriuskey's plan with a new location for fridge and stove and, as there doesn't appear to be a designated dining area, by rotating the island there should be enough space for a dining table on the same level as the kitchen and the dividing "wall" between pantry and office is made up of tall cabinets to allow for more storage space and the three separate zones are open to the window