With all that information you posted in the first one... you didn't take a second to notice something...
the Bahro... Yeesha... Esher... all their power is derived from the core power of the Bahro. Remember Yeesha's speech at the end of POTS (Who alone can Link at will? Who alone can use the Linking Cloths? The Grower. I am the Grower). What this means is that the Bahro (and interpretly Yeesha and Esher) Linked not WITHIN an Age... but to an Eder Tomahn of sorts and then back to the Age.
Even so, here we hit something: Yeesha already created Linking within Ages.
Relto. You could use your Relto book without changing anything. If you're still in Relto, you're linking while within that Age.
Boom