I know the few remaining SW stations still on the air desperately need the income, but... surely, there's another way?
There are not too many business models.
Advertising? Local advertiser who want to target listeners in a foreign (far away) land are few to non-existent.
Donations? Different countries, Different currencies... You would have to take in a LOT of donations, over and over again to keep a SW operation alive, and not to mention offer compelling programming that people want to pay for.
Government funded was one such model for a long time, but the government mission is seeing other more fruitful ways to get their meessage out, internet, video, web, streaming, cell-phone apps.
Seems the viable life of a SW station is to operate as a "function hall". Different people come in to use the facilitiy for different purposes (wedding, mercy meal, retirement parties), and they will pay to use the facility, but you are only interested in attending if you are part of that specific funeral, wedding, class reunion, etc.
I would think that the best scenario is a combination of the two. Sell to time to others for religion and whatever and also provide some compelling [programming. (WRMI seems to have a combination of things.) Right now for most. it seems like it's an all or nothing situation.
But keep in mind how very expensive it is to fund, maintain, and keep a SW station on the air.....before you even think of funds for compelling programming.