I would consider ReFace by Upol as suggested by Jeff. It is like putting a smooth artex on and then sanding it smooth. As Jeff suggested it can be put on with a small gloss roller, this would give you a really good base for you final finish.
I have a feeling that it shouldn't be used over etch primer, you will need to double check.
It covers really well, two coats would hide the rivets on Mick's Monaco! (almost).
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