Ian has advised me that a British machete that resembles a Kachin dha/dao was issued, and we see these occasionally. However, I don't believe there were really very many military dha made. The Burmese irregulars surely brought their own weapons with them into service.
My example appears well made and simple enough to be mass-produced, but I've never seen another like it. If these were made and issued in large numbers, I can't help but suspect we'd be seeing many more of them on the market today.
(Mark, for the record, I believe Ian found that photo.)