First of all I don't work for UM, I am just a fan and own a lot of UM printers, so I cannot give official answers.
All of the things you want to achieve, is not possible with some simple steps. But nobody can or will stop you from "hacking" into the system. The printer is quite new, so you will not find any useful information and how tos on the internet. But when you try to get access to the printer, you can install everything there if you have enough space on the board.
DF is closed source and there is no way to install it locally, it is a cloud solution like gmail.