DHCP would be a great feature for Whonix-Gateway. Whether it is safe, or not safe, or can be made safe is unknown. Requires original research. The open question is, does DHCP have a feature, like “please tell me the IP address of you upstream router”?
Adding a DHCP daemon to the whonix internal network is not a good idea, if thats what you mean. It has a large attack surface and from what I saw on the subject, can almost certainly be an attack vector. I know that the internal networking in KVM has its own emulated DHCP routing, not sure about VirtualBox though.
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May you please provide some more specific information here (if available to you)? Thanks!