Hi jim, you're right, it's not Dyckia choristaminea.
But, there could be a ton of unknown species in Dyckia world :-(
At first glance, it look like a member in Dyckia remotiflora complex,
but the channeled leaf with more prominent spines,
I should determine your plant is looked pretty close to Dyckia saxatilis.

This was identified as Dyckia saxatilis that's blooming in my collection last year.
Sorry for out of focus pic, but you could take a look the flower habit.

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thanks stephania, that does look a lot like mine hopefully i'll get a bloom this year to check that also. if so mine has seen snow and 9*f/-12.8C