VXLAN on a site to site?

Hi,

i was wondering if someone could shed some light on what im trying to do. Currently have Site to site Openvpn working great no issue. what im trying to do on Site B i have a cluster on proxmox, the idea is that i want to take one of the servers to Site A, but the problem is that it has a different Ip from Site A, would it be possible to move that server to Site A and somehow keep the same IP and be able to communicate with the Site B with the site to site?

Now i was reading about the OVS on proxmox using VXLAN but not sure how i can approach this. would pfSense or the edge swich have any involvement or just the OVS on proxmox sending the packet?

Lets say i want to move 192.168.100.252 host to Site A without losing the IP and without changing the IP so my cluster and keep working. in way to somehow lie to the cluster thinking its still on the same LAN. or am i just going crazy thinking its possible?

See picture

https://imgur.com/a/ABi0aMy

Thank you