[Question] Network config between 2 Hyper-V hosts with multiple isolated farms

Hi guys, I need to configure a very particular setup and could use an advice on how to handle the networking angle. Here's what I'm looking at:

Hyper-V 1: Farm1(vnet1), Farm2(vnet2), Broker(vnet3).

Hyper-V2: Farm3(vnet4).

What I need to achieve, is that vnets 1, 2, 4 cannot communicate with each other, but all of them can communicate with the broker on vnet4. My thinking is that way to go is to make the broker(vnet4) as a sort of DMZ, that will be able to communicate both ways with other vnets, but won't allow any traffic between them - is this a feasible scenario? If not - would appreciate to hear other options.

Here's a (poorly) drawn visual implementation, just in case: https://imgur.com/a/dtDT67F

Thanks in advance!