We are unable to switch to the other conversion approach because it does not support Asian TTC fonts. It seems that Aspose.Words only supports TTF fonts which is not part of the default fonts that get installed with Windows.
I'm not sure if Asian TTC fonts are/(can be) supported by Aspose.Words. I believe Aspose.Words team would be in better position to answer this query so I'm moving this question to Aspose.Words forum.
The original discussion can be found here.
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Thanks for your request. Unfortunately, Aspose.Words does not support TTC fonts during rendering yet. I linked your request to the appropriate issue. You will be notified as soon as this feature is supported.