I finally got it to work!
New import option for sensor positions in FreeSurfer surface coordinates:
IO: Reading sensor positions in FreeSurfer surface coordinates · brainstorm-tools/brainstorm3@d2aa6b8 · GitHub
Updated import script for your atlases:
Update Brainstorm import script (hardcoded fiducials) by ftadel · Pull Request #10 · christian-oreilly/infant_template_paper · GitHub
Atlases were rebuilt and uploaded on the Brainstorm web server.
The current version of Brainstorm already offers all the atlases for download, including all the default electrodes positions.