@njf, that isn’t really what this thread is about, but you might need to mess with the mouse emulation setting in the bios. Just search here on the forum for mouse bios setting or something like that. You should find some information on it.
Not having the trackpad work when booting off of the Macrium recovery media is more an issue of the Macrium. They control what drives get bundled with the kernel they are booting from. So changing the mouse emulation in the bios might let the trackpad work with whatever generic driver they are loading.