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[Off to the shed again]

Hammerite do a good primer which works on aluminium and cast iron, so that should be fine for all areas of the engine, you can then paint it any colour you want from, say, Plasticote spray enamels. How about aluminium for the aluminium areas and black for the rest?
Hope this is helpful...... Chris.

[Mark M]

Ha ha! You are right, alloy finish is just so not hipster!

REgards, Mark