Have you thought about replacing the 7805 with a switch mode regulator? 
More expensive than cheap-as-chips 7805 but waaaayyy more efficient. That 
means they will run cold and you shouldn't need to worry about the ambient 
temperature in your case. Two to look at, both of which are pin-compatible 
with 7805 as I recall.

*Murata OKI-78SR-5/1.5-W36-C*

*Traco TSR 1-2450*

I've used the Traco one myself in a clock design, and it's fantastic - very 
small and straightforward to use. Likely around 90% efficient in your 
setting.

Cheers,

Jon.

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