I found an old thread on this subject at https://tug.org/pipermail/xetex/2011-February/019886.html
I am looking to do the same for skt to help someone who wants to use old source files with skt and ITRANS to pdf. https://github.com/Shreeshrii/xetex-itrans/blob/master/wikner-skt-iast.map has a draft map based on the velthuis-devanagari map, but currently it does not support the initial Capitals (eg. AA needs to convert to Ā, "S to Ś). Any suggestions on how to add these. Thanks!
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