FWIW, we have a large Somali immigrant population in my area, and I remember seeing an article a few years back which discussed the issue of financing home ownership in a culture that doesn't allow traditional mortgages. I believe the solution was to tack on a large "processing" fee to compensate for the interest. This is a different article about making business loans: https://www.theatlantic.com/politics/archive/2014/06/the-city-that-offers-sharia-compliant-loans-to-muslim-business-owners/431079/

--Sister Crow