To summarise: we didn't have the audited statements so requested an extension from DIEZ, they gave us 60 days for the audited accounts portion only - the rest of the requirements had to be submit on time, but that was more-or-less straightforward.
In the end, we reached into the bag of companies we surveyed last year for CIT conformity, there were several that went from pretty high-end (at least we thought) to budget. Our seemingly high-end accountant wasn't able to help with neither the book keeping or audit side of it, so we ended up reaching out to one of the cheaper guys, RVGUAE, and so far so good; fingers crossed, haven't heard anything from DIEZ since submission in mid-March.