Send approval to alternative person in case the usual approver has approved before

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We have a rule setup in AP approval with three stages, on Invoice Header level:

STAGE0: Approval from accounting group
STAGE1: Approval from business
STAGE2: Approval from CFO above 5000 EUR

In some cases, the CFO will also be the approver for the first stage. In this case, we want someone else to approve the invoice in stage2, to enforce a four-eyes principle for the high amounts.

We have thought about specifying these accounts for which the CFO can approve, but this is not the complete picture. Sometimes the CFO is in an approval group, but someone else approves. So in this case, the approval in Stage2 should still go to CFO.