Therefore, Numbers 33:3 does not refer to the following morning daylight after Passover
I think you're off your stride here, my friend.
First: That idea is contradicted by JW literature itself. The opening sentence from the Insight article you quoted above plainly states,
"Passover (Heb., peʹsach; Gr., paʹskha) was instituted the evening preceding the Exodus from Egypt." (Emphasis mine)
This is not the only such statement in JW literature either...
Second: That we are talking about the daylight period of the 15th is necessary, given the context of a triumphal procession in full view of the Egyptians.
Some
translations explicitly use the words "morning" and "morrow" and
others, like the NWT emphasis the back-to-back linearity with phrases
like, "Directly the day after the Passover" and "The very day after the Passover"
Third: Injecting an additional 24 to 36 hours into the story doesn't fit the symbolism. The Insight article goes on to comment:
"The
partakers ate in a standing position, their hips girded, staff in hand,
sandals on so as to be ready for a long journey over rough ground."
This observation is nonsensical when we have the Israelites milling around, doing who knows what, for the entire daylight period of the 14th and the entire nighttime period of the 15th.