You can turn an AppVM into a template to create disposable AppVM, which is what you need to do here (ideally).
Just open the qube settings, go in the tab “Advanced” and check “Disposable template”. Then, you can make a new disposable qube that will be able to use this appVm as a template.
There are 2 templates at work here: the base template offering the system, the appvm template providing the customization of /rw and /home/ and the disposable qube starting a copy of the appvm but… disposable