I would like to use bash script to change the icon in a panel. I want an icon to function as an on-off or open-close toggle with different icons showing the present status. How can this be done?

I'm afraid this isn't possible - you could write your own (Javascript based) applet and integrate the functionality from there.

I'm working on the exact same problem, it’s no big deal to change the corresponding .desktop file, e. g. with sed:

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sed -i -e 's/ONE.svg/TWO.svg/g' /PATH/TO/FILE.desktop

The only problem is: To apply the icon in the panel there's some kind of refresh of the panel (or just the starter, if possible) needed. The same refresh takes place when you right-click the icon, change something in it's settings (or have something changed in the .desktop file before) and click OK. It's just the process of re-reading the .desktop file, is it really that big a deal to make it doing this via the shell?

A brutal and time-consuming, yet possible way to force reloading is the restart of the whole desktop environment:

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killall plasma-desktop && plasma-desktop

But this can't be the only way, or is it?