The advantage of a Molniya satellite would be that a large portion of the Southern Hemisphere is covered within the visibility limit of a satellite global antenna beam. Most of Antarctica would be covered within the visibility limit of a typical high gain spot beam. ATSC assessed issues of partnering and cutting deals with others to cut and share communications costs at South Pole Station. Satellite solution costs can be offset considerably with multi-users. Excess capacity can be sold off.
Partners can lease or buy as a block creating economic viability.
Agreements might be made with NASA-NRO, etc. to use satellites or take over spares. Validate costs for a fiber optic cable to Antarctic latitides where standard GEO satellites and other selected options are possible. Continue search for satisfactory inclined GEO satellites. Explore arrangements to take over old satellites-pipeline of potential satellites. Determine route survey details for land cable.