Something with pseudobulbs. Where I live, my cattleya alliance plants fit that bill much of the year. I often don't have to water at all during the wet season, and not often during the winter- only our dry springs usually have me keeping the hose out.
I second the Ausssie dens that may be native to your region. My spatulata dens would be as easy as the catts, if we didn't get too cold in the winter for them. (the catt alliance is much hardier in that respect).
One problem- in a pot will require repotting, frequency may vary depending on pot and media used and your growing conditions. For less frequent repotting, I'd consider inert media.
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