Nananthus transvaalensis can take -10F if good drainage is provided. Has proven hardy in Colorado at several locations along the front range. Plants can reach 10" across and flower during the spring and fall months. They can put on quite a display. Probably the easiest Nananthus to grow outside with Iceplants. This is a close relative of Aloinopsis.
I do not guarantee these in a zone 5/6/7 because everyones growing conditions are different but this would be a good trial plant to grow in your cold outdoor garden. Try to plant outdoor 90 days before 1st hard freeze.
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