Is there an easy way to add realistic mustaches and/or beards to characters in CC3? (If there is, I sure can't find it.)
Even if it's in a content pack, or plug-in, I'd be ok with it.  

I have a whole bunch of tutorials on this.  Here's one (look to my channel to see the rest):

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley

Unfortunately that doesn't particularly look quick, nor does it look extremely realistic.  Thanks for your reply, though.

You can make it as realistic as you want (certainly as realistic as any hair for iClone).  At less than 60 seconds, though, it couldn't be quicker.

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley