Of the parvisepalum group, actually most can go quite cool, like P. malipoense and P. micranthum. The one that benefits from a bit more warmth is deletatii. Paph Magic Lantern (micranthum x delenatii) is also cold-tolerant and can be quite vigorous. So the micranthum would be the source of cold tolerance,.
lovely! do you grow these outdoors all year? I thought these were more warm growing.
All year except the rainny days, because I'm avoiding rot as much as possible. Outside but not in the open space, it is situated in the side alley where there isn't a lot of harsh open wind.