Rules about citizenship and foreign players

[LeoFM]

So I am creating a database for the Faroe Islands but there is one thing that I have been unable to implement. Faroe Islands has a rule which makes players that have played in the country for 3 consecutive years count as non-foreign. (in Faroe Islands you can have at most 4 foreign players in the match squad, exclusively players from the Nordic countries). You could solve this by setting the 'years to gain nationality' to 3. But this would counteract the real time period of 9 years to gain nationality in the Faroe Islands. 

Does anyone know a solution to this? If so, I would be very thankful.