If you give it a very very thorough cleaning inside and out, and Paint it with heat resistant paint it may be fine, but paint makes the vanes thicker and reduces heat transfer, but it's a trade off I think you are better off making though, just try not to get too much paint in the honeycombs.
A fan will be usefull at low speeds, but once you get moving they don't do much.. A manual on-off switchable fan would probably be best.
I hope you get it all sorted and end up having a brilliant holiday, please keep us posted..
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