Just bring all your documentation, they basically just physically go through it, as well be prepared to open your banking app and show proof of funds, they ask a few simple questions regarding your application and plans
there is no 7 day window, there is a 21 day window, and that window is to report, not to skip reporting. You can report in person up to 7 days after the due date.
It doesn't hurt to combine all your passport pages into a single PDF, you can combine those pages into one of the other documents that you need to upload, because they may ask for it anyway and yes you don't have to stay in one hotel.
When was your current passport issued, is it your first passport? Pictures of every page in your current passport and combine into a single PDF file. A letter signed by you stating you have never traveled abroad.
Anonymous participant Research posts using the group search tool for your chosen embassy to get an idea of what they have required for similar workcation scheme applications.
You sound more like a freelancer than workcation. It would completely depend on the embassy you apply at and how convincing your cover letter is going to be to explain it.