My $0.02 (US-based, I offer my pecuniary apologies to other markets):
Since audits are supposed to follow a plan and management reviews are supposed to have an agenda with identified metrics, I think it would be appropriate to establish a Quality Plan (approved by Executive Management) with specific goals and timetables. The Management team would then be able to establish a meaningful set of metrics. Typically Management Reviews aren't frequent enough to do more than gross oversight, and Internal Audits are likely to identify necessary corrective actions... so I'm concerned that without an established Plan you could be setting yourself up for a cycle of remediation (or three-mediation!) that could easily confuse things.
Part of the Quality Plan can explain how 'legacy' areas of the Quality System are supposed to work with (and interface with 'newly-minted') other areas of the Quality system until they get updated. This way even if the Internal Audit is reviewing a 'legacy' area of the quality system, there are meaningful criteria to be used during the evaluation. Internal Audits really aren't supposed to be 'for cause' audits... and presumably before rolling out 13485-compliant processes the deficiencies in the system were already identified.
Executive Management should be able to review the progress of the Quality Plan, as well as metrics related to the enacted portions of the plan, including internal audit results.