Duo Network Gateway For External Website

I am curious if DNG could be used to provide access to external websites which use ip white-listing.

Example:
A publicly accessible web page https://www.example.com only allows logins from white-listed ips.

If the public IP of the DNG is white-listed, and we configured DNG to link to the external url, would I be correct in assuming it would function to masquerade the users IP to be that of the the DNG when using the DNG url associated to the external website?

Currently for this site users need to VPN in, but I would think DNG could work for this scenario.

Can anyone confirm if this is possible?

Thanks!