Maybe if I say it the same but differently...
Same bandwidth per carrier as today. Same bits per carrier. Same power per carrier. But do four at the same time and they don't have to be necessarily adjacent as long as the software tuner(s) can see them all simultaneously. Aggregate the bits for an effectively equal bitrate to one larger channel. Think OFDM or port trunking.
You see, I have no idea how Outernet is getting its slot allotted on the bird, how much it costs, or who owns it. For all I know, it could be an unused subcarrier or control channel of some other larger entity.
What if the service could be promoted to big Inmarsat tenants as a 'public service' of sorts that they could donate unused pieces of bandwidth for in exchange for promotional consideration, like PBS does. PBS viewers probably don't buy a lot of stuff from Lockheed/Martin, but there it is, sponsoring the news.