i was buliding a house in london last year, and had to replicate the stone cill and window heads, a company called preist restoration from tottenham came out did a plaster cast and made them for us, £2000 for the sets for 2 baywindows top and bottom, very helpfull company ,the other option is some form of epoxy repair motar MSH
Pretty easy job if you have done them before, minefield if you have not! Ive used a local pre cast company who i supply sizes and photo too and they make them up in concrete that looks JUST like Sandstone, not sure how they do it but there really good! last one i had was a 5ft door/window lintel 10in deep cost £90 perfect colour shape etc. those sections would be about £25 each if you was buying a few, checkout local precast firms...
a two part epoxy resin repair mortar with special lightweight fillers
give them a ring and see if the product would be suitable
if I had a choice of cutting a few bits of wood to form a shutter or to have to remove the windows, most of the brickwork and rebuild the pillars then i know which route I would be going
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ive done a few of these when we used to do council repairs around chelsea, kensinton we used to cut of flush with window insert resin rods (stainless steel) shutter new sil with drips and so on i just cant remember what they used to pour them with as it had a different finish to concrete we try and pick my brain
the problem with a lot of them cils is the rusted rebar in the concrete ones and the stone ones split in the winter with water ingress