Czech CAA means EASA rules.
What you state about the hours is correct, and you have the instructing requirements - there are no rules on what the training you do must be. Any EASA instructor (CRI or FI) can have conducted the flights.
The person who signs your licence and submits paperwork for the Cz.CAA can either be any EASA examiner, or a Czech approved "FCL945" instructor (can't be a 945 from any other country) IF that instructor did at least an hour of your logged instruction.
Make absolutely sure you do it before the rating runs out. The specific paperwork to be declared to the national authority changes with country, so you need to find out exactly what's needed from the Cz.CAA.
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