A good portion of Pablo Vega's OSTs have been added to music streaming service Spotify. Here are the albums that are currently available:
A Valley Without Wind 2
AI War: Ancient Shadows
The Last Federation
Skyward Collapse: Nihon no Mura
Searching and selecting Pablo Vega as an artist brings up multiple individuals by that name at the moment, so for now it's probably easier to search for the music by album name. More albums coming soon!