Hello Charles and welcome to the forum.
Have you tried to make the custom balloon symbol with the outlined text in the symbol. I know you can use text in a sketch and have the text take on a parameter value. Not sure if you can do this with symbols or not.
Trying to use Creo Parametric for Marketing literature is a bold move. Automating it is even bolder. Good luck on that.
As for line weight; pen tables. By default the geometry lines for drawings is set by the drawing. There is an obscure option in the view properties that asks where the colors come from. This may work for solid geometry edges when set in the model. By default, it used the drawing's setting.