Welcome to the forum. The best I can think of would be to set one up like you've done, and save it as a Block so it would be easier to re-use. Hopefully someone else will have a better idea.
Glenn Schroeder - I don't think there is a better way then what you mentioned... A little bit of manual stuff, unless you can do something like Rob Edwards mentioned here What are your most impressive tricks of solidworks, Please spread.
I've made an improved method for making symbols via macro. It's not quite finished but it does a basic job. I used the problem as part of learning the api. I'd like to go on and add sketch text support and file naming. As it stands you have to modify filename directly in the code or the macro will try and save the result to *my* desktop.
The idea is to create sketches for each symbol you would like to create. If you rename the sketch that becomes the name of the symbol, if you give the sketch a description, that becomes the symbol description. If you add sketches to folders, the folder names become the name of the library.
Construction lines are ignored, but solid arcs can be created using construction arcs.
The attached part has a few examples and a bounding box sketch, that is the box that defines a character. Your sketches (symbols) can go outside this box, it's just a guide
edit: felt shabby uploading unfinished code... it now copies the code to the clipboard instead of writing to my personal desktop