I am wondering if it is ok to submit a small enough flash drive with
previously made projects or is this asking for trouble overall?
If the jobs you are seeking require project experience, a flash drive containing stuff you did on your own isn't going to overcome the lack of that requirement.
Almost certainly, the job requirements you read meant "project experience in a work environment", not "things (projects) you did on your own".
Perhaps they exist, but I know of no interviewer who would bother to plug in a flash drive from an unknown candidate, in order to explore the fun projects they did in their spare time.
Instead, if you land an interview, be prepared to talk about what you have done on your own, and how you believe it indicates your ability to handle real work projects.