For extra safety, I'm wondering how to avoid damage to the host if "something" happened.
Tiny isolated DC/DC converters exist. It would be too much a hassle to make mine again (been there, yada yada).
Data isolation is another concern. It's a static design so no transformer is possible. An optoisolator is a good idea, or a more expensive isolator from ADi http://www.analog.com/en/products/interface-isolation/isolation/standard-digital-isolators.html
Safety first...
I found the CNY17-2 in my archives but I still have to locate the DC/DC.
The optoisolators change the signals that now work in current mode, so it's less sensitive to EMI. OTOH it increase the power consumption (but it's not critical).
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