Static public IP address + OpenVPN + Setup

Grettings,

I'm trying to figure out a way to make things work. Basically, my coworker needs an access to our client's backend dashboard and to get access they need to whitelist our public IP. Since we can't get a static IP from our ISP, it could be possible to do so with OpenVPN. If any of you know any other, smarter solution please let me know, but for now I'm going with this. So, if I uderstood everything correctly, I need to set up our OpenVPN access server, generate certificates, coworker would connect to VPN, would have a static ip address I assigned previously and get whitelisted. I'm new to all this so please if someone could explain a little bit if I'm wrong. Thanks in advance!

Implement IPv6. Get a static prefix from your ISP. Provide the network admin a prefix, the /48 for your site, or a /64 if restricting to one subnet is preferred.

The other organization will also need to implement IPv6. Tell them that static IPv4 is not practical for you.

Source IP address allow listing, while a useful control, is often not sufficient. IP addresses can be spoofed, or internet routes altered maliciously. Confirm this application is using strong authentication.