Zawgyi Tonemarks in Latin Script

[Richard Wordingham]

I've been cleaning up some mojibake and I'm stumped on how to clean up
what are intended to be U+1037 MYANMAR SIGN DOT BELOW (the original
text hijacked U+1095 as best fitting U+1E45 LATIN SMALL LETTER N WITH
DOT ABOVE) and U+1038 MYANMAR SIGN VISARGA in Burmese text
transliterated to the Roman script. While U+0325 COMBINING RING BELOW
works for the first sign, what should I use for the second sign? I want
to preserve the Romanisation, not retransliterate.  I presume the
Zawgyi-encoded pseudo-Unicode worked fine in the original Zawgyi-attuned
rendering system. 

If I apply the Myanamar script signs to the Latin letters, the renderer
punishes me with dotted circles.

Richard.