On Xen bridged and routed vifs are both bridged and routed. Maybe? How?

Question

Computer networks

There is a server in Hetzner'e. gentoo OS. It has Xen 4.6 on it. Additional IP addresses purchased (1 main + 5 additional). These additional addresses are running Xen's domu . At the same time, Xen uses the vif-script vif-bridge.
Everything was fine until it was required to run more virtual machines. Because add. addresses are no longer given, a subnet was purchased. Subnets in Hetzner do not work through a bridge, but through a route. That's actually the problem: is it possible to configure Xen so that the old nodes work in the old way, and the new ones work simultaneously through the route? Is this possible in principle, and if so, how? Maybe someone has a ready-made script that will allow you to do this? Is it possible to use the network-script directive multiple times? and how then in the settings of the nodes to prescribe which network to use?
Of course, you can transfer all the old nodes to the subnet and not take a steam bath, but this option is considered if you can’t win with little blood, because. changing IP addresses on nodes is fraught with domain downtime, license transfers, and other problems that we would like to avoid. Yes, and 5 additional addresses will be idle for nothing. A trifle, but unpleasant.