I found a pic of Nichelle and added it to the post so you can see what she looks like. They do have one other Trek alumni already this season, but it's someone from Enterprise not TOS or TNG.

Chuck is slightly reminiscent of Jake 2.0 if you ever saw that, but for some reason I like it better. More humor, in part.

I haven't seen either of the others you mention, though I have heard great things about The Riches.