The EZIO8SA will definitely work for you.
Also, got your input on using form C relays on the 2X4. Not many other people have been asking, but it may be worth looking into.
Or how about another version of the EZIO8SA with 8 opto inputs, 8 form C relays, and 12 Volts (for using dry contacts with the opto inputs)? I don’t see myself ever needing analog inputs of 1-wire stuff and would rather see that real estate used for more opto inputs.