First, thanks for answering,

The main subnet is 10.0.0.0/22 on VLAN0. I don't have a VLAN in mind but I'm thinking about VLAN1000 to more-or-less have a resemblance to the subnet.

All hosts are on vSphere 6.7. One of them has a slightly different build number, older than the rest but nevertheless it's 6.7. Except for one, they all have multiple NICs, I have spare SFP+ NICs but it can't be modified; it's an [otherwise unused] iMac I'm using for its GPU. It's most sitting there idle though so I'm fine wiping its settings or removing it completely.

Are you by chance saying using a standard switch would be the best approach??

Thanks again!