What an exciting project! I would start off with sectioning it with shelves. perhaps include a photo to give us an idea how narrow it is?

Personally I love angles & splays, BUT they have to have purpose and be functional. Without seeing more surrounding context hard to comment but i can't help wondering why this all being so squeezed in one area, but then almost wasted/under-utilised space in-between the island and the table - it's like the pantry's boxing/internalising the kitchen which is not ideal.....either way I'd make sure that it flows and is functional and not awkward anywhere

Note - This is what I think of the concept in general. It's not a criticism again the OP - I think Butler's pantries are better idea's in concept than practice. I've not understood the rationale for a kitchen thats separate to your kitchen, unless of course you are prepping all your meals in there in which case what is the kitchen for? I think it's a sign of the times that we have more space and more money than we know what to do with when we start installing two kitchens in the same space. Of course I understand the rationale for a pantry. A place to store food items that may not be used frequently and the same for appliances. In the days when food was only available in season and the only way to preserve certain foods was to pickle and bottle it then a large space to store those supplies was necessary. We live in the modern age now where any food can be gotten easily and cheaply all year round. So these spaces are housing mostly appliances that we rarely use. And if we rarely use them you have to ask yourself why you are holding onto them?

removing a partial wall as shown in your photos is just as expensive as there is no corner support..my suggestion is to make two wide doorways without removing supporting structures....with limited space, you need to take advantage of whatever is available and the random linen cupboard wall should not be structural and relatively easy to remove...my suggestions adds new walls for the linen and pantry so biggest challenge will be matching the cornice (we would steal old cornice that would be hidden by the new pantry/linen to patch cornice for the new walls on kitchen and hall side and maybe recycle the original linen cupboard doors) your plans shows that there is over a metre of wall behind the original stove which makes it the best location to keep the stove as well as being the cheapest location... moving the stove would cost about $500 without allowing for extra cost of custom cabinetry as well as a range hood that has no where else to go!!