I do not have the same item of application software that you have, so I do not know if the idea suggested below will work. However, it might be worth a try as I have used such a method with other application packages.
What happens if a font is made with three glyphs as follows.
Glyph 1 has the outer frame, the inner frame and the character.
Glyph 2 has the outer frame and the inner frame.
Glyph 3 has the outer frame.
In use, first use glyph 1 in the colour of the character, then add glyph 2 in the colour of the inner frame, then add glyph 3 in the colour of the outer frame.
I know that this works in PagePlus, a desktop publishing package made by Serif, where one can use three text boxes and overlay one on top of the other.
For example, I did that some time ago with some of the fonts in my Galileo Lettering collection. Looking back in the forum it was in 2005.
The following example shows the effect. Please note how the outer edge of the letters is in each of the three fonts that are used to build up layers. Only the topmost colour is displayed on the screen.
http://www.users.globalnet.co.uk/~ngo/mosaic.PDF
As I say, I do not know whether this technique would work in the application software that you are using.
I hope that this helps.
William Overington
2 July 2010