A workaround until some kind of satisfactory adjustment is made might be to simply use COLON for VISARGA. Or...
VISARGA ⇒ U+02F8 MODIFIER LETTER RAISED COLON ANUSVARA⇒U+02D9 DOT ABOVE ...as long as the font(s) included both those characters. य॑ यॆ॑ य॑ं -- anusvara last यॆ॑ं -- " य॑: -- colon last यॆ॑: -- " य॑˸ -- raised colon modifier last यॆ॑˸ -- " य॑˙ -- spacing dot above last यॆ॑˙ -- "
