Unless I misunderstand you host and guest are on the same machine.
fwiw, and as another option,
I run multiple VMs at the same time on different virtual desktops,
accessing their desktops via virt-viewer,
switching between them / their virtual desktops with a mouse roll.
Two of these VMs have Thunderbird clients accessing different classes of email.
The VMs are clones so easy to set up as many as I need.
Was fast under Virtualbox and is equally fast under virt-viewer/libvirt/qemu/kvm.
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