Once you arrive at destination it would cumbersome to use them again as you would loose your taxi to your gate, what a strange way to finish your hard earned transcon 10+h flight
The *realistic* way would be WAITING for a proper parking to be freed, not killing the AI. If there are no parkings available, maybe you set your AI traffic too high.
I will come back with the missing gates/parking for ZRH, from memory they were some in the T, F near Cargo area and E midfield area. I'm not refering to any ground chart but actually taxying there you could see the taxi line and gate number painted on the apron but would not find these gates number in the GSX menu.
Please come back with the precise, exact, list of gates, so we can check.
However, I assure you that all gates are there. If they are not, it's possible you have an AFCAD conflict, like the one that comes with your AI Traffic package, so GSX is not reading the FSDT AFCAD, so parkings won't match. This could be verified in the parking customization page, which will indicate the name of the AFCAD used by GSX.