I wouldn't worry overly about the sunlight. We use everything from garters, milks, corns, balls, boas and more outside at some venues such as provincial parks, conservation areas, etc. Even mostly nocturnal snakes like eastern milks can be found out and about in the wild on sunny days occasionally. We've never seen anything react badly to being in the sun, with the obvious caveat about being careful that they don't get too hot. It is quite possible to overheat a snake, especially a small one, just by handling it in the sun.
The bugs that might get onto your snake wouldn't be any worse than what might wander into your house on their own.
Neighbours and escapes are the only serious issues, IMO.