The PFD and MFD of the Cirrus can be modded now that we have the Aviator liveries now with access to the panel.xml, although, that actually could have been done before as it’s just the G1000.
Unfortunately, the flight characteristics are still locked away. I imagine, however, that a flight_model.cfg could be created by somebody knowledgeable. Systems.cfg would be more difficult without the base file.
If it were me, I’d probably start with the DA40NG and go from there. The POH and Systems manuals for the SR22 are readily available. I’m sure somebody with a little experience could do at least a good a job as Asobo did. Possibly even make the buttons accessible with some help from ModelConverterX?