As you are in Denmark, why not visit Akustikken in Århus, Danguitar i Grenå, and Orkestergraven in Århus, they have a lot of ukuleles and probably also someone who can demonstrate it for you. Maybe just call them beforehand and make an appointment.
There are many in dba.dk. Why not try a cheap one, just to see if it's possible to learn?
PS: One good thing about online shops, such as Thomann and others is that, being in the EU they all conform to the law that you can return anything within 14 days, no questions asked and Thomann will even arrange the return and I think it's free of charge but check that.
PPS: If you come to Odense, you can try one of mine, I have different sizes.
If you can use your thumb, there is a thumbpick(which I have) which is the only thumbpick I know that can be used for strumming both up and down. A thumbpick is a plektrum fixed on your thumb. Kodiak thumbpick
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