Scripting question: Change to next/previous font style (without specifying style name) - AI/ID/PSD/

Changing font styles on the fly has always been a PIA in Adobe programs. Because of the support for multiple font styles (a good thing), you can't just CTRL+b for bold, for example, and there isn't currently (to my knowledge) any other keyboard shortcut for changing font style.

I'd like to set up scripts to switch font style. But I'd rather not have a separate script for every common style name--that would eat up way too many keyboard shortcuts.

Is there any way via script to select the next/previous style--without using style names? That way, I could have one Previous Style and one Next Style script, and use those to quickly iterate between styles.

For example, I might run Previous Style twice in a row to switch from Medium to Regular (Medium > Italic > Regular).

I personally use Photoshop, Illustrator, and InDesign, and I'd be interested in scrips for any of them.