I don’t know whether the thing you are asking for is technically possible and maintainable. However, the project and the community are very aware of the issue. The measures already in place are:
- Certified Hardware works guaranteed, since the team will “ensure compatibility with the supported major version”.
- Community-recommended computers is a constantly updated list of machines that are used by multiple community members and work well with Qubes OS.
Beyond that there are some principles one can employ when looking at a machine:
- check the system requirements to make sure the CPU supports Vt-d and the machine has enough memory etc.
- check the HCL whether someone else has already tried, and follow the link under the reporters name to the thread that discusses this machine.
- if the machine works well with the Fedora version dom0 is based on, that’s a good sign as well
- avoid brand new machines / CPUs as it takes a while for them to be supported by Linux and that Linux version to make it into dom0