Footnote: I was not completely satisfied with the colour match of the rattle can mix and I still needed some brush on touch up paint.
After much searching and getting nowhere, I ended up going to
Westside Panel & Paint at Ipswich. Ray (the paint match guy there) made a batch of touch up paint ready to brush and a can of appropriately thinned paint which was ready to spray using a
Preval spray gun.
I wish I had gone there in the first place. The match is spot on, the Preval is a great little gadget and Ray was very helpfull. All up, including a can of thinners it cost $50.