[quote=@Unoedipal]
<Snipped quote by IncredibleBee>

It's not, that's why when what the Fuyuki Grail actually did became public in Apo universe, everyone went "holy shit we thought they were joking". Also, the fact that the Fuyuki Grail's purpose is to reach the Root isn't public knowledge; even in the Apo universe where Grail Wars became a biweekly occurrence, that fact was only known to a handful of people in the World. 

I'll allow this cult to have managed to find a way to, via Greater Ritual, do something similar to the Grail's summoning on a much smaller scale and summon/bind a Servant independent of the Grail, then choose to send the resulting Servant/Master to Fuyuki so that they can reap the fruits of the real ritual. However, as a matter of course, the Container for this makeshift Servant will be noticeably worse than the container made by the actual Grail, as given by Apo.
[/quote]

Does this work for you, Sodium?