After spending more time handling VRFs within VyOS the answer from @Viacheslav is best

In T6211#189615, @Viacheslav wrote:

Probably the best way will be moving the config to the vrf section (not implemented)
For example:

set vrf name foo service dhcp-server shared-network-name eth1 option default-router '192.168.1.1'
set vrf name foo service dhcp-server shared-network-name eth1 subnet 192.168.1.0/24 lease '300'
set vrf name foo service dhcp-server shared-network-name eth1 subnet 192.168.1.0/24 range default start '192.168.1.10'
set vrf name foo service dhcp-server shared-network-name eth1 subnet 192.168.1.0/24 range default stop '192.168.1.100'
set vrf name foo service dhcp-server shared-network-name eth1 subnet 192.168.1.0/24 subnet-id '1'

And start several instances, each with its configuration.