Embedded stories in SHORT SUN?Whorl

Just a far-fetched thought stemming from the indicated contents of STRANGE TRAVELERS: the items omitted from that collection include "Empires of Foliage and Flower" and "The Boy Who Hooked the Sun", the two "Brown Book" stories not included in the text of BOTNS. Could GW have kept those stories back in order to embed them in a Severian-narrated portion of THE BOOK OF THE SHORT SUN? It's an appealing idea, but a complete stab in the dark... =====