You should recruit non-English speakers/readers to SFI because language is not a barrier in SFI.
At the bottom of each page on the right side corner, there is language translator that can be used by non-English speakers or readers. There are many people who are already members to SFI and there are no complaints about the language translator that is in place. Recruit all human-beings who are over the age of 18 years irrespective of their place of origin or language.