Thank you for sharing your question with the Wefugee community!
As far as I know (and it is also described on this website), one requirement for the Beschäftigungsduldung will be, that you need to hold a Duldung for at least 12 months before applying for it. "Hiding" from the authorities might therefore be no good idea. Please also see additional requirements in the above mentioned document and feel free to get back to us with any further questions!
All the best,