Hi Andrea and Sara, I see by the note in your schematic that you have considered tying the /CS input low. You could perhaps then use the ISO7762 - bring one CONVST over (for both A and B) and the SCLK as inputs then have DOUTA, B, BUSY and FRSTDATA as outputs. Tne FRSTDATA output is almost redundant since you could use the falling edge of BUSY as an interrupt. You could also stick with the ISO7763 and send CONVST, SCLK and RESET over, bringing DOUTx and BUSY back. You would still need to have the GPIO expander isolated as well, are you considering something like the ISO1640 or ISO1641?
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