Adding dhcpcd + "allowinterfaces vmbr0" in /etc/dhcpcd.conf does work, but pve is dependtend on isc-dhcp-common isc-dhcp-client so you can't remove them.
By the time of writing it was not dependent.
They added a dependency recently so removing ISC software is now impossible but everyhting works yet. Until Proxmox finds a way to mess everything up again.
