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Kev,
I've been using an Ol' Zuiko 200mm f4 lens as an electronic finder on my C11 for many years.
I've coupled the lens with my ATiK16ic (because it was available) - worked very well....
Recently needed the ATiK16 for spectroscopy imaging so replaced it with the DMK51 I had......again the results were very good.
I made up a 1.25" adaptor using the body of a lens extension tube and a machined aluminium holder, epoxied in place.
(This is illustrated in Astronomical Spectroscopy for Amateurs, Fig.12.13, p 154.)
I think if you search eBay you'll find some lens to T thread adaptors, which, with the addition of spacers could do the job.
Re suitable cameras...I think the ASI120 FOV is pretty small, I'd be looking for a larger chip - maybe the ASSI174 or similar.
Finding mounting rings or a good method of rigidly aligning the electronic finder is another interesting challenge!!
Just my 2c
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