We did most of this, and have been using it for a few years. However it depends upon the ISC DHCP server, which is now EOL. The replacement, KEA, does not support LDAP, and there are no plans for it to.

I think the reason is that they didn't want to put dynamic addresses in LDAP, because LDAP is thought of as read-mostly. The way LDAP is used in IPA, of course, means there are lots of changes going on. For most sites, I suspect putting leases in LDAP would be OK. But ISC isn't going to help, I don't think.