Can I use an atlernate glyph rather than the default glyph for a font I've uploaded to my template?

 If the alternate versions are part of the same font, then each version has its own unique unicode number.  It will be something like ᅜ You will need to enter this in the HTML script.  Charmap.exe is one way to get a unicode number for a given glyph.  In Windows 7 charmap.exe can be found in: Start » Programs » Accessories » System Tools » Character Map.  If the number unicode number is:
3721 (decimal) you type ຉ
04A7 (hexadecimal) you type &x4A7;

The semicolons are important, so please don't forget to include those in the script.