I'm with you on most things.

Two counter points though

• a normal date is already 14 characters: 2023-10-25-2100

• while I dislike the religious connection of the year numbering, I actually don't care about it. And adding ten thousand to it doesn't change anything. It's like putting a spoiler on a slow car and then pretending it's better now. No it isn't you are just expressing your desire for something better in a shitty way that is actually worse. Seriously, adding a 1 to the year is a useless change.
  If you desperately want to change year zero, there apparently exists the Julian period and Julian day number:

The Julian day number (JDN) is the integer assigned to a whole solar day in the Julian day count starting from noon Universal Time, with Julian day number 0 assigned to the day starting at noon on Monday, January 1, 4713 BC, proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar), a date at which three multi-year cycles started (which are: Indiction, Solar, and Lunar cycles) and which preceded any dates in recorded history. For example, the Julian day number for the day starting at 12:00 UT (noon) on January 1, 2000, was 2451545.