Getting side tracked by the mention of agency requirements,
I didn't answer your question.

To answer your question, there is no agency requirement for
what you're trying to test. Both input and output are not
covered by the low voltage directive because they're both
unsafe to touch. So the only requirement is operational
insulation which your test proved.

I also failed to mention that Most standards allow for DC
testing at 1.414 times the AC voltage required.