Thank you so much for all these wonderful suggestions. I would definitely try them out. We know it is at least 2 weeks school/kindergarten lockdown. Luckily shops are open as normal. We are not short in anything yet.
I might design some papercut out dolls like this one! I thought it might be fun for a 3 years old, and it will keep painting/drawing. If I manage to do so, I will release the pattern for free on my website, so all stay-at-home parents can use them if they want to.