How to deal with variable length strings in Keyman Developer?

I am working on incorporating Tamil numbers into a keyboard layout using Keyman Developer, and I’ve implemented the following Keyman Developer code:

c *** numbers
store(numberKeys) '123456789'
c *** 1-௧ 2-௨ 3-௩ 4-௪ 5-௫ 6-௬ 7-௭ 8-௮ 9-௯
store(tamilNumbers) U+0BE7 U+0BE8 U+0BE9 U+0BEA U+0BEB U+0BEC U+0BED U+0BEE U+0BEF
c *** 0-௦ 10-௰ 100-௱ 1000-௲
store(tamilTens) U+0BE6 U+0BF0 U+0BF1 U+0BF2

c adding 0
'`' + '0' > '௦'
'`' + any(numberKeys) > index(tamilNumbers, 2)

c adding 10, 100, 1000
'௧' + '0' > '௰'
any(tamilNumbers) + '0' > index(tamilNumbers, 1) '௰'
'௰' + '0' > '௱'
'௱' + '0' > '௲'
'௲' + '0' > '௰௲'
'௰௲' + '0' > '௱௲'
'௱௲' + '0' > '௲௲'

any(tamilNumbers) + any(numberKeys) > context index(tamilNumbers, 2)
any(tamilTens) + any(numberKeys) > index(tamilTens, 1) index(tamilNumbers, 2)

Now the Tamil numeral system works differently than just writing the numerals.
In that I use a backtick to switch between the two. For example, `0 represents Tamil zero, `1 represents Tamil 1, and so on. To write a number in Tamil, such as 254, it needs to be expressed as 200 50 4. My code works correctly for this, as it would give ‘௨௱௫௰௪’ when I type `200504. Similarly, for 1113, it would produce ‘௲௱௰௩’ when I type `1000100103, which is the expected result.

The issue arises when we need to represent numbers greater than 10^3. In Tamil, symbols such as ‘௰௲’ (10^4), ‘௱௲’ (10^5), ‘௲௲’ (10^6), ‘௰௲௲’ (10^7), ‘௱௲௲’ (10^8), ‘௲௲௲’ (10^9), ‘௱௲௲௲’ (10^11), ‘௱௲௲௲௲’ (10^13), ‘௲௲௲௲௲’ (10^15), ‘௱௲௲௲௲௲’ (10^17), ‘௰௲௲௲௲௲௲’ (10^19), ‘௲௲௲௲௲௲௲’ (10^21), ‘௰௲௲௲௲௲௲௲௲’ (10^25), and so on are used.

In essence, I need to automate the process of handling variable length strings. When there is a sequence of ‘௲’ characters,
for example, ‘something+௲௲…’, and I press the ‘0’ key, it should change to ‘something+௰௲௲…’.
If I have ‘something+௰௲௲…’ and press ‘0’, it should become ‘something+௱௲௲…’,
and if I have ‘something+௱௲௲…’ and press ‘0’, it should transform into ‘something+௲௲௲…’.

My question is, how can I automate this process of handling variable length strings in my Keyman Developer code?"

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