Maybe use IPv6 to set up the tunnels.
https://docs.fortinet.com/document/fortigate/7.4.4/administration-guide/600821/ipv6-ipsec-vpn
https://community.fortinet.com/t5/FortiGate/Technical-Tip-IPv6-ADVPN-Hub-and-Spoke-Deployment/ta-p/253196
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