Its not exactly NAT as you are thinking but check the following:
ip multicast helper-map
When a multicast-capable internetwork is between two broadcast-only internetworks, you can convert broadcast traffic to multicast at the first hop router, and convert it back to broadcast at the last hop router before delivering the packets to the broadcast clients. However, broadcast packets with the IP source address of 0.0.0.0 (such as a Dynamic Host Configuration Protocol [DHCP] request) will not be translated to any multicast group.
Thus, you can take advantage of the multicast capability of the intermediate multicast internetwork. This feature prevents unnecessary replication at the intermediate routers and allows multicast fast switching in the multicast internetwork.
If you need to send a directed broadcast to the subnet, the outgoing interface of the last hop router can be configured with an IP broadcast address of x.x.x.255, where x.x.x.0 is the subnet that you are trying to reach; otherwise the packet will be converted to 255.255.255.255.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...