I found a way to automate getting oxygen into space.
1. make oxygen compressors and collectors on the oveworld
2. set the AE system to export empty tanks into the compressors with a precision export bus
3. put a basic import buss on the compressors
4. in space set the AE system to export full tanks to the decompressors with a precision export buss
5. put a basic import buss on the decompressors
You may need to add more of each compressor and decompressor depending on how much oxygen you need.
This setup requires a quantum link to get the AE system to connect.
If you do not have the quantum link, you could probably use an ender chest to transport the items back and forth