Welcome to the forum.
I can assure you that your skills are on demand... banks and insurances never get bored of databases
You will hardly find any job ads for part time SQL developers but you have good chances if you apply directly. I guess the smaller software houses that supply the banks are more flexible when it come to the part time: They have a hard time to attract good staff as they are
a) not as famous as the banks directly on the one hand and
b) do not pay as much as the contracting agencies on the other one...
so as soon as you know when you will actually land here you can start to have a look around and you should be fine. There is hardly a better place to find IT jobs in Europe than Switzerland.