I'd be very surprised indeed if this made much difference to airflow - or enough to effect engine temperature.
The most important thing here is having the right amount of good quality oil. Also the right kind of riding style when the temperature increases (keep the bike moving forward but keep the revs low).
I actually think a front (or rear) mudguard extender is an excellent idea to stop mud being flung up into the engine. It never ceases to amaze me why the manufacturers never fit these extenders as OEM? Perhaps it's the look who knows?
Once the front of the engine has been covered in mud it's very difficult to get the stuff off.
ACF50 = damn expensive! If you are lazy and wish to get long term protection with just one application, this makes more sense.
I use GT85 = Cheap (£2.99 from Aldies). It leaves a thin film which protects nicely. I also use copious amounts of WD40 year round.
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Triumph Bonneville 800 (2004), Yamaha XT600E (1999), Honda XBR500 (1986).
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