I already did some work for Webinar a while ago. I'm based in Argentina and my accent is mainly from here. I can read the neutral words (I did the translations from other webinar texts to neutral by myself), however my voice has a known accent, if you're fine with that. I can deliver the work in two days. If you prefer instead a 'neutral' accent, I'll suggest you to find a national broadcaster from Colombia.
In the other hand, I have a female voice (not for me) but she's not a national broadcaster, but she's from Russia (Born and raised). I don't know if you want only male voices. If you're interested in that as well, we can talk about that project later.