Um.....
https://forum.atlas-games.com/t/e-mail-verification/172/1
You said "suitable" but never explained what made it suitable. I'm also still waiting to see if any specific "further information" is obtained from Viscaria, Vin, and possibly a host of others spend a season exploring the regio. If further information has been provided, I lost it in the shuffle between all my travel and mechanics kibitzing.
Viscaria is sure as hell going to build a bridge to cut the trip from 2 hours to 5 minutes, even if it isn't a grand design -- that's vital time away from her lab!
And after re-reading the description of Iosephus's sanctum and the path leading to it, she's probably also going to build a faerie staircase on the side of the covenant's mont, so that people stop tromping through the mulberry trees and other vis sources.
The Hermes Portal may be the historically used solution, but as things stand in 1222, we don't know that magi will trust each other enough to arrive with anyone else's assistance. Recall the spoiler information about Korvin's Trip to Phoenix, and how Viscaria's paranoia is likely to interpret that.