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Why isn't the SMPS already regulated?, simply adjust it to give 10V if it is.
But in LM317H datasheet, its saying 1.2V–25V Adjustable Regulator, not anywhere saying 50VEasy and cheap is a linear regulator. Your requirements just fit inside an LM317H. At 50 V input the regulator will be dissipating 4 W, requiring at least a heatsink and maybe a fan depending on the available air.
ak