Yep . . . we've used that technique as well . . . threading the mike under the wig or through hair, and it is great for some whose voices could do with a bit of help.

When these face bud mics first apeared, I'm sure  they  started out doing this & it wasn't untill the advent of flesh coloured ones, it became more aceptable to having them on the face, almost up thier nose. But these will certainly help & make it easier to mask them.

when i was working in the uk from 1993 - 2003 this was standard practice. hairline or wig.

Is that all there is? Well if that's all there is my friend, then let's keep dancing.
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this has been stanrd placement for a long time. generally the mic used will be a dpa 4066 lapel usually in conjunction with sennheiser beltpacks, i would assume sapphires are using the sk5012 beltpacks, which are also the most used beltpacks in music theatre in australia. i would probably stick clear of these in an amateur sense as they can be volatile if you don't know how to eq them, you should if you can insert an eq over each radio channel if you can, or at least insert over a subgroup and send mics there, but that isn't really aoolicable to music theatre with the amount of mics you need to be muting or unmuting.