What you can do is to "sell" something in lieu of donations:
E.g. - To support me please buy this wallpaper image file of my project logo. Or one-day email support etc.
You can always add a note that Finland laws prevent you from accepting donation, and this is the only way you can accept money from patrons, and even provide a link to the law in question.
(Note that depending on the laws in your country you may have to register as a freelancer / small business and pay taxes. In most countries this will be free or near free, and you probably won't get enough money to reach the threshold aftwer which you have to pay taxes).