Below is the advertising blurb for a new generation of satellite communications which would appear to move more towards SSB functionality. No mention of costs but it may be something to keep an eye on.
Simon


One-to-Many Global Communications with Just a Push of a Button with the new IC-SAT100 Satellite PTT from ICOM

SATELLITE PTT (Push-To-Talk) is a two-way radio system that uses the Iridium® satellite network. It can be used as a communication tool in remote, isolated areas where there are no mobile phones or landline network infrastructure. Even if terrestrial network infrastructure is rendered unusable by human or natural disasters, SATELLITE PTT can provide a stable back-up, independent from other networks.
One-to-Many Communications
Wide Area Global Communications
Real-Time, Low-Latency Communication
Built-in Emergency Key
Waterproof, Dust-tight and Durable Body
1500 mW Powerful Audio
Long Lasting Battery Life
Secure Conversations with AES 256-bit encryption.
Conventional Radios and IP Phones Interconnection