Long standing problem with Vedic tone markers and post-base visarga/anusvara

[James Kass via Unicode]

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˙ -- "