OPNsense HA with EdgeOS

[LikelyInfection]

I recently stood up an OPNsense VM to test it out as a replacement for my increasingly flaky EdgeRouter Lite. My thought was that I could switch to the OPNsense router but keep the EdgeRouter as a backup. I'd set up VRRP and then whenever I was doing maintenance on the OPNsense hypervisor the gateway IPs could just failover and I would retain some basic network functionality.

Unfortunately it looks like VRRP is not available on OPNsense and CARP is not available on EdgeOS. Are there other solutions I could consider? It doesn't seem like CARP has wide availability outside of FreeBSD.