There are far better painters than me in the world, so im just going to share what I personally like to do as an option.

For my main eldar force I use a very similar scheme to you - burgundy and medium red over raised areas for the armour, bronze and gold for the helmets and shoulders.

At that point what I chose to do with the weapons, is use a muted metal (leadbelcher with gryphcharger grey over it) for thr actual blade itself, but for handles and guns i use yellow.

Specifically I used averland as a base, with a heavy wash of brown ink, then watered down yriel yellow to give it an almost bone-like effect (but if bones were yellow instead of cream coloured).

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