My accountant had it confirmed to him in writing by HMRC (UK) that if you are submitting a VAT MOSS report, then no EU sales list report is necessary. (This was my accountant's understanding of the rules, based on a course he'd been on - but he got it in writing to make sure). Accordingly, we did not submit one. All has been well, as expected.
Note also that SAF-MOSS is not a reporting format used by HMRC for regular reports. It's intended for audits; and their guidelines say that it's not compulsory even then - they are aware that different software will output in different formats.
David