No, there is no shortcut that I am aware of.
Not all pet palette options have a shortcut.
You may want to add your vote to this wish if you haven't already.
https://archicad-talk.graphisoft.com/viewtopic.php?f=24&t=63142&p=289344&hilit=shortcut#p289344
Barry.
One of the forum moderators.
Versions 6.5 to 27
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
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