Hi zanderbush,
I don’t know whether it is possible to run ExBert on Colab, but it is definitely possible to run BertViz on Colab.  (I use it.)    Do you need the extra functions of ExBert, or would BertViz be enough?
I would expect it to be possible to install ExBert on Colab, though you might have memory problems if you want to do the Corpus part.
I don’t think bert-base-uncased is one of the available options in ExBert, so you might have to use bert-base-cased.