Actually, after you flash to the new firmware, you can use the new Universal Flasher 2.0 to get back the clock or wait until there are more hacks made to go with the Universal Flasher 2.0.
https://www.mobileread.com/forums/showthread.php?t=26831
I plan on trying to make a unified font and hold enter to turn off the 505. So after I am done we'll have the clock, the unified font, and the ability to turn off the 505 by holding enter.