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Here's the situation you have even if you are able to start both services

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root@opnsense:~ # sockstat -4l -p 67
USER     COMMAND    PID   FD PROTO  LOCAL ADDRESS         FOREIGN ADDRESS
dhcpd    dhcpd      61078 13 udp4   *:67                  *:*
root     kea-dhcp4  964   14 udp4   192.168.22.1:67       *:*
root     kea-dhcp4  964   16 udp4   192.168.42.1:67       *:*
root     kea-dhcp4  964   18 udp4   192.168.62.1:67       *:*
root     kea-dhcp4  964   20 udp4   192.168.63.1:67       *:*

As you can see, this will not work. ISC always bind to *:67 whatever you do. They cannot co-exists.

It seems to me this is still an unresolved issue.  I have disabled ISC on all but one interface and migrated the rest to Kea.  For this to work, I found I had to stop ISC entirely, restart Kea, then restart ISC.  Otherwise, the Kea log reports "Address already in use - is another DHCP server running?" errors.  If I then have to reboot opnsense (e.g. after firmware updates), it seems ISC will start before Kea and I will not have DHCP servers active on any of the interfaces except the one that I still have on ISC (Kea will report "address already in use" for the other interfaces).

Is the intent for now to support running ISC on some interfaces and Kea on others or are uses expected to migrate all interfaces to Kea?