Thanks for your input Detlef! I'm gonna enjoy it a bit first but maybe a few years down the road.
Some follow up questions:
Is the Hmong / Laos attribution indeed the most likely one?
Is there anything known about the handling of the Montagnard ones? It has the proportions of small polearms but feels more like a sword, which puts these in a sort of strange and intriguing no man's land for me. This one is light enough for single handed use, but presumably that is not how they were wielded, as the long grip makes it somewhat awkward.
If anyone knows of a youtube video that shows their use it would be instructive.