Thank you for sharing.
I think keeping RE is a good diversification. You may not be able to subscribe to more debt for another opportunity so I will keep yours.
Refinancing your Home while unemployed was discussed in another thread. There is not much experience post RE but interested. The irdea will be to take the longest fixed mortgage available to you (e.g. 10 years).
In your position, I will work 3 extra years if you can handle it and do a mix of 2nd pillar buyback and ETF investments with your savings.
Worst case scenario, you can already retire in an EU country but your kids may not get the same opportunities as studying in Switzerland.