save a message with pattrstorage?

Hello,
My patch uses VST plugins loaded into a few vst~ objects, and I need to save/recall which plugins are loaded.
So far I am saving integers that correspond to the plugin number in a umenu. Something like that:

This works great as long as the plugins installed on my computer don't change.
If I happen to instal another plugin or if I open my patch on another computer, the list changes, and the integers saved in pattrstorage don't correspond to the right plugins anymore.

So my question is: is there a way to save a message like "plug cool_plugin23.vst" in pattrstorage instead of an simple integer?
Or is there a workaround in order to be sure that pattstorage is actually recalling the right plugins?

Thanks.
Florent