I received a reply from Fujifilm in which a representative explained, they have no intention of releasing an angle finder in the near future. Also, he does not know of such a finder which mounts to the X-T1. But he has forwarded my query to his colleagues at Marketing and R&D.
So unless I can find a shop which might custom-adapt an existing angle finder to the X-T1 body, I guess I'll forget about a switch (from Canon to Fujifilm).
I'll then stick with my Canon gear but keep the X-Pro1 with 35 and 18mm lenses for traveling light and downtown photography. And the X-T1 with 23 and 56mm lenses will go on ebay. I had also bopught a leather half case for the X-T1 from Luigi Leicatime in Italy (plus one for the X-Pro1). I really like his cases, they're top quality!
Maybe in the future, ...
Thanks for your assistance, guys!