Dear szz9pza,
Tomorrow I will look to your two last answer and try to see if it could progress.
Reading you in regard of disposable fedora template sounds that could be on fact my main leak of Qubes syructure knowledge.
It is the main problem I met : it is difficult for me to well understand where each command line must be done. Some guys said (where it sounds logical) it must be done in sys-net where others lets know that sometimes it must be done in the fedora template.
But perhaps did I personnaly misunderstood.
This is why I will take time tomorrow to see if I could reproduce what you explained in your last two answers here above.
Still thank you for your help and I apologize to take your time so many times.
Have a good day.