Well, Art, the answer you received from S-TEC is not complete in its response to the manner in which you phrased your question. They did not tell you that you cannot fly the holding pattern in NAV mode. In fact, they lead you to believe you can fly the hold in NAV mode. The GNS430 does not provide this course guidance in GPS or VLOC mode to the A/P.
The answer you got from S-TEC was a generic answer not specific to the installation in the SR20/22. Half of the challenge of getting the information you need is in asking the right question. Your question in your first post was, specifically, “So how do I do the above described hold?” I thought I provided a complete answer. You could have left out all of the references to RAIM, GPSS, etc. because anything related to GPS is completely irrelevant to your question. Those references, along with the statement that you could fly a hold with NAV and ALT, implied a misunderstanding of how the GNS430 & the S-TEC 55X operate together. I simply tried to shed some light on the subject for you.
Finally, S-TEC went to great pains to let you know what would be displayed on the remote annunciator that you will not be getting in your new Cirrus. They also misspelled it, five times.