Problem placing numbers after Vedic accents in Tamil

I am having a problem placing a number after a vedic accent in Tamil. The minimum map file is

**********************************************************************
LHSName "tamv"
RHSName "UNICODE"
LHSDescription "Tamil With Numbered Consonants for Vedic Accents"
Version "1.0

Define g U+0067
Define u U+0075
Define l U+006C
Define a U+0061
Define m U+006D
Define umatra   U+0BC1
Define virama   U+0BCD
Define zwnj U+200C
Define zwj  U+200D

Define ga   U+0B95
Define ma   U+0BAE
Define la   U+0BB2

Define three   U+2083

Define unsc    U+005F
Define anudatta U+0952

pass(Unicode)
g u > ga umatra three
l a > la
m > ma virama
g u unsc > ga umatra anudatta three
***********************************************************************

My tex file is

documentclass[letterpaper,12pt]{article}
usepackage{fontspec}
usepackage{polyglossia}
newcommand{tamvfont}{Noto Sans Tamil SemiCondensed} 

newcommand{tamv}[1][1.20]{
    catcode`^=12
    catcode`~=12
    catcode`_=12
    fontspec[WordSpace=1.50,Script=Tamil,Mapping=tamv,Scale=#1]{tamvfont}}

setlength{parindent}{0pt}

begin{document}
{tamv gulam
gu_lam}
end{document}

My output is

There are two words. The two words are exactly the same except that the second word has a Vedic Accent below the first letter. I want to get rid of the circle and make the 3 as shown in the first word.

documentclass{article}
usepackage{polyglossia}
usepackage{newunicodechar}

setmainfont{Noto Sans Tamil}[
  Script=Tamil,
  Renderer=HarfBuzz]
newfontfamilyscriptsfont{Noto Sans}

newcommandsubthree{{scriptsfontsymbol{"2083}}}
newunicodechar{₃}{subthree}

setdefaultlanguage{tamil}

begin{document}
^^^^0b85^^^^0bc1^^^^2083^^^^0bb2^^^^0bae

^^^^0b85^^^^0bc1^^^^0952{subthree}^^^^0bb2^^^^0bae

அு₃லம

அு॒₃லம
end{document}