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Do you need to feather/taper? Will be much easier without but might not work with your door at the other end of the room.
hoefla-
I think I'd definitely need to do something if I wanted a single surface throughout as there is an area about 2 ft long which drops over a period of about 3 inches a height of 2 inches. So a very steep drop over a short distance. After the 2ft it gradually settles. I'm vaguely considering getting a big drill and taking all the concrete out then levelling but realistically that's beyond my abilities. Would solve a lot of problems though.
CYOA
Thanks @Airhead and @hugo7
What about this cork stuff someone (possibly @chrisbmx116) recommended in the past, installed floating rather than glued:
https://www.colourflooring.co.uk/collections/cork-flooring/products/espira-corka
https://www.colourflooring.co.uk/pages/corka-installation
Instructions there suggest mechanically fixing the hardboard (screws). It does mention a moisture barrier if installing over concrete but presume covering the whole room in hardboard would negate this?