Simply my interpretation only and IANAL..
Regarding Safe School Zones.. You're concerned with the offense 1457-B-1. When you then read 1442 the first line clearly exempts anyone with a DE CCDW license which is provided by 1441.
My interpretation is that as long as you have a Delaware issued CCDW you are NOT breaking the law. I'd suggest carrying this information (and your lawyers number) with you anytime you are entering a school (or safe school zone). If for whatever reason someone calls LE on you it could keep you out of cuffs or jail unless the officer is anti-2a then you're screwed anyways since you'll then be arrested regardless. A decent LEO could listen to you explain this and let you go. There have been a few incidents where this has happened though none that I know of in Delaware unfortunately.
All this said.. and as Obleo stated... it is "Concealed" Carry. No one should ever see it unless its needed. If that happens make darn sure it is 1000% needed and still expect the SHTF afterwards.
§ 1457 Possession of a weapon in a Safe School and Recreation Zone; class D, E, or F felony; class A or B misdemeanor.
(a) Any person who commits any of the offenses described in subsection (b) of this section, or any juvenile who possesses a firearm or other deadly weapon, and does so while in or on a "Safe School and Recreation Zone" shall be guilty of the crime of possession of a weapon in a Safe School and Recreation Zone.
(b) The underlying offenses in Title 11 shall be:
(1) Section 1442. — Carrying a concealed deadly weapon; class G felony; class D felony.
... and ...
§ 1442 Carrying a concealed deadly weapon; class G felony; class D felony.
A person is guilty of carrying a concealed deadly weapon when the person carries concealed a deadly weapon upon or about the person without a license to do so as provided by § 1441 of this title.