How much reduction in Baud rate are you proposing. Currently we get I believe 20 MB a day?
Assuming you can reduce the size of the antenna then I imagine you will then want to market a lantern the size of a mobile phone.
At the moment, is the current Lantern Wifi Hotspot getting enough solar power to receive and process a Outernet signal for 24 hours?
Unless the E4000 tuner and the Chip computer has a massive reduction in size and power requirement, I cannot see a smaller Lantern running for very long without recharging.
My feeling is get the current system working with the best download rate. Miniaturizing the system for me is not that important.
I think the current Solar powered Lantern if It can be tweaked to work 24 hours continuously as a solar Hotspot is a very good solution.
Possibly you could make the pointing easier by having a internal GPS chip and compass chip and then have RED(port side) led on left and green (Starboard LED) on the right. The GPS calculates the position relative to the Inmarsat satellite and then the CHIP either tells the left or right led to flash indicating which way to swivel the lantern.
For elevation setting, both leds could flash fast for too flat. and flash slowly when to low. No flashing when aimed correctly.
If you dont want to put a GPS chip in you could Just have the E4000 decode the L-Band GPS signal that is coming to the Lantern L_Band antenna. ( I acknowledge the current LNA SAW filter may be blocking the the GPS frequency)