I did a search around before, but couldn't find anything more myself either...

I suspect a parented prop over the region of the eyes, combined with a morph to make a recess for the prop might be the way to go?

Unfortunately I can't suggest anything existing that I've come across, as yet...

...I'll keep both eyes peeled though

I wondered if it might be feasible to make a prop based around the BBEye... which is available at Bagginsbill's freebie site...

https://sites.google.com/site/bagginsbill/free-stuff/bbeye

...e.g. make a set of eyelids and surrounding skin region to enclose the BBEye and merge into the rest of your face skin texture?

I'm not sure I have anywhere near enough modelling skill yet to offer to do that myself... or else I would offer to have a go.

Maybe someone else will read this and get some ideas?