I don't think its Mon at this point. there aren't any closed loops on the rounded characters which about half the Mon char. have.
I've checked the Mon character set, and while similiar, I can't find any truly matching chars. It almost appears to be a Burmese rendering of the Khmer or Tham script. It seems certain to be one of the Brahmi based scripts, but there are so many possibilities, I really don't know. On the Pali text website, the text they call Burmese doesnt have the Mon 'e loops' either, but it isnt quite like yours as well. there may be a Burmese Pali script or a Burmese version of Sanskrit whose character set is harder to find. With a syllabic language like this whose characters are more or less interchangeable, I could imagine there might be some odd syncretic hybrids that only an expert would be able to recognize. it may not be anything like that at all, but I just couldnt see any matches except for a few base characters. very puzzling. maybe i just didnt look at it long enough. I'll try printing these out maybe so i can turn them around in different directions easier. I'm not sure - it's definitely not Himilayan (or from that region) - Burmese with some sort of diacritical marks seems most likely, since Pali also used the script (or a variant, I think Mon) - Alan