Guide for disposable sys-whonix replacement?

Hello,

I would like to construct disposable sys-whonix net vm.
My purpose is using both of plain-tor and vpn-over-tor simultaneously. For this purpose, I feel it’s better to use two separate net vms.

I’ve already experienced to make a disposable sys-net by following this instruction

I would appreciate your help. Thanks…

Possible solution
To obtain disposbale sys-whonix, do the same process to make a disposable netvm, but creating DispVM under whonix-gateway template.