Yes, essentially by unzipping the OTA .zip file and running a tool such as the LineageOS payload extractor on it. See the section mentioning extract.py under Extracting proprietary blobs from LineageOS zip files | LineageOS Wiki.
No, I do not expect them to be able to do that - not without special effort on their part. The firmware partition images I described in the post above live in a private LineageOS repository that the MicroG people cannot access. To do things right, they would have to get the partition images themselves, from LOS or stock, and include them in their docker image build process.
Your options are:
- Build the MicroG-patched image yourself, and use that. You can update the partition images from a stock Fairphone OTA manually. Requires unlocked bootloader.
- Get in touch with MicroG and tell them you want the extra “radio” partitions as part of their downloads. They might have more ideas on how to get that done.
- Migrate from the latest Fairphone release to Lineage4microG - thus you will already be using the latest partition images.