The standard alternative is the routine 4-hour treatment which is administered 3 times per week, in a clinic setting, using different, larger equipment. That would be more difficult to do in a smaller, home setting.
Either treatment series would require steady electricity for device power and refrigeration.
http://www.marfan.org/about/related-disorders
I have been looking into Marfan and there is no mention of dialysis,more like heart/skeletal problems. He may have needed constant medical treatment but now that I look most likely was not dialysis.
Yeah for sure Bernard, cave living probably precludes a long life for what he had even with CIA help.