Any solutions will heavily depend on what your mission is.... What are you looking to decode with satdump? How long for? Just a few hours to prove you can do something, or you planing to leave it run for weeks or longer?
The reason I ask is that satdump is really a one trick pony. It decodes weather sat images and anything else folks try and force it to do (Like VFOs) is usually a bad fit.
I don't / won't write it up for Inmarsat decoding on my site since its just the wrong tool for that job due to its horrible way of 'supporting' VFOs which most Inmarsat decoding requires.