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@Hovis I would stick with plasterboard if you're plastering over. You can get small easy carry style plasterboards rather than the huge sheets. MDF may well expand when plastered due to moisture.
And yeah you can screw it with dry wall screws which are anti rust.
@Hovis I'm not sure a ready made filler will cure that well on the deeper chunks. You might want to get a small sheet of plaster board and use some adhesive to stick it on (called dry wall adhesive) then get a ready made skim mix to go over the top. It'll certainly dry quicker.
You can get some deep fillers but its looks like quite a large area to fill.