No, I have not seen an out-of-the-box way to do this. Adding one or more ActiveLinks that watche the selection of the (re)assigned group and throws up an error dialogue if that group is assigned would be the only way I can quickly think to achieve this. Less-than-ideal, but it would serve the purpose. They could continue working their existing tickets but nobody could set new tickets to their group due to the new AL(s) watching the (re)assignment.
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