Since a symbol font has a limited number of glyphs and you need at least 200, you might be better off creating a Unicode font. That also allows spell-checking, which is turned off for symbol fonts.
Note: only the first 224 characters of symbol fonts will be accessible, a space and up to 223 printing characters.
For ease of typing you would probably find it easiest to assign glyphs to the usual alpha characters plus áéíóú etc. ANSI character set.
Another way would be to assign the glyphs to Greek character code-points and switch keyboards to type with the font. That is better if you want to mix Latin characters for German or English with your Swiss text.
The proper way might be to assign the glyphs to the Private Use area, but then you will need a customized keyboard to type with the font.
Converting bitmaps to glyphs is easy enough: about 300 to 500 pixels high is recommended. See my Tutorial on scanning an entire alphabet.