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Thanks again! Do you have links to those recommended products? I’m only really planning an ok job, not a proper one, under no allusions of first timer ability, just want it to last 2 or more years.
chrisbmx116-
Have a look at this page. They describe the use cases for each of the products. Fibrex is now called Tough Multi Filler, Murex is called Rock Solid Repair Filler. They are the 2 most popular in the trade in my experience. I have used the others for specific jobs but Tough Multi Filler is my go to exterior filler. Murex is useful for rebuilding edges of masonry, like the corners of cills. Skimcoat might suit what you have to do there though.
https://www.toupret.co.uk/professional-filler/category/exterior-surfaces
Airhead
If you keep at it with a sharp 25mm+ chisel take off anything that's not bonded and use Fibrex / Murex for filling/facing you should be able to avoid removing anything that's bonded to the brick.
Often you'll take off 10-15% in chunks especially from around cracks that often go through the cement to the brick on surrounds.
You might still remove quite a bit but you can deep fill with those fillers.
I know the heritage methods guys will burning sand to make mastic etc. but I'm not seeing failures over 15 years with the methods I've used so I feel confident that they have some merit.
The area above the window is often way more solid, you'll be unlikely to crack large chunks off in my experience.