Kea has a hook to Unbound for static mappings only. And none to DNSmasq if I am not mistaken.
For dynamic leases to be registered in DNS the current standard way is to use DNSmasq for DHCP and for DNS for the local domain. If you use Unbound as the client facing server and configure a forward for the local domain to DNSmasq of if you have DNSmasq answer to the clients and forward all recursive lookups to Unbound is a matter of taste, IMHO.
For dynamic leases to be registered in DNS the current standard way is to use DNSmasq for DHCP and for DNS for the local domain. If you use Unbound as the client facing server and configure a forward for the local domain to DNSmasq of if you have DNSmasq answer to the clients and forward all recursive lookups to Unbound is a matter of taste, IMHO.
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