PhilDAS-
It used to work with the 'old' formulation (xylene based solvent I think) with a thin coat of cellulose paint - I'm going back to the 80s, and I'm fairly sure the modern version is more environmentally friendly and much derided by anyone who has to use it.
As I remember it, the whole point of Hammerite was you could use it on less than perfect surfaces (some rust and dodgy prep) and build up a thick coating by applying on an extra coat every 20 minutes or so. The hammered finish was almost an orange peel texture which covered / distracted from pitting and surface corrosion - more functional repair than aesthetic finish.
What you need to test the (ok, my) theory is someone with time, a tin of Hammerite and a rattlecan. The level of 'hammered' finish depends on thickness and drying temperature (I think) and there may be issues with solvent compatibility that will need checking. I've looked in my stash - only Smoothrite I'm afraid, which wouldn't help regarding texture.
Rustoleum do a 'Pewter' hammered finish - being realistic it might be a case of using that as near match in tone, or Hammerite green as a similar hue / colour?
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MrE
Hammerite green for the texture then over-spray with Halfords best match for colour?