malayalam VOLT programming

I'm currently in the process of using Microsoft VOLT to programme a Malayalam typeface and I have run into a few problems that I just don't understand how to fix. I'm currently testing my file in Microsoft Word 2010.

1, Malayalam has glyphs known as chillaksaram which, as I understand it, are formed through inputting a string like this:
na (ന) + virama ( ്) + ZWJ [Control+Shift+1]= ൻ.

Within VOLT, I have included the relevant strings into a post-base substitution lookup and feature. This lookup sits below Akhand and Below-base form lookups that I have created.

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