We just bought a house in 1973, well insulated. We wish to install a hygro-adjustable VMC (currently no VMC no ventilation), however we do not wish to change the windows (very stylish wooden, rounded shape but simple glazing). The only current air intakes are in the lower part in the WC and bathroom. Do not we risk having a feeling of cold in these two rooms (air intake and extraction in the same room), and an inefficiency in the other rooms?
It is likely that your fears are justified and your VMC will be ineffective in rooms without air intakes... In your case, a system overpressure could have been more judicious (by insufflation).
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