It works perfectly for Alexandrians:
The authors of Electrope technology were Lalafell, fled from the source via the Azem Mc-Guffin. Other Alexandrians openly admit that no one understands Dimensional Fusion (and by Proxy, Electrope) like they do.
So: couple Source refugees with a unique resource, constant war over Electrope and absurd desperation and you get the modern Alexandrian tech.
As for Garlemald: lets just agree to disagree here. I do not consider anything Sci-Fi that would be doable with current earth technology.
The only Sci-Fi elements that Garlemald has is stolen & adapted knowledge from the Allagans... wo, if we want to be technical about it: got large parts of their knowledge from the unsundered Ascians / Ancients.