Your fogging/condensation issues would be much worse, and they would start immediately. If you live in a wet air/humid environment, such as the coast or southern Ontario, then fogging is part of life. Things you can do to mitigate or control fogging would be; remove some foam from around your goggle seal to promote airflow, do not have a hat brim or surface covering over or above your eyewear as it'll help trap in moisture, open up the collar of your combat shirt so heat isn't funneled straight up your face.
Any place you play that has insurance will likely require full sealed ballistic or paintball eyewear. Safety rated won't cut it as it illegitimate the insurance. If recommend ballistic eyewear regardless, as any safety rated eyewear, such as ANSI or CSA, says very clearly, that once the lenses are scratched or take a hit that they are no good. That doesn't mean that they won't stop a BB, but the manufacturer won't back them up. So one BB strike equals they go in the trash now.
Don't scew around with your eyes, get proper protective lenses designed to take projectiles continuously. If you're a sweaty/high body heat kind of guy, look into a paintball mask with thermal lenses and fans. Your other alternative is to get a large/non low profile goggle, with good face space and mount a more aggresive fa kit to it.
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