An idea struck me when ANet mentioned that guesting will be restricted to just EU and NA servers/
Why don’t we make a sort of hub server on the EU servers, and on the NA servers, that you can transfer to freely, and the game will save your slot on your current server. You still have to transfer your data and sit though the delay for that, but it saves your main server along with that data.
To save space, said hub server consists only of Heart of the Mists, and is meant to be used as a stepping stone for guesting to any EU or NA server while on the opposite server cluster.
It’s a workaround, sure, and takes away from the instantness of guesting to other servers, but it does enable people to do so if they have the spare time.